Proof-reading comments in base/message_loop/.

This CL contains a few minor changes to comments that I made while
skimming through the code. Mostly spelling changes.

Review URL: https://codereview.chromium.org/1255673004

Cr-Commit-Position: refs/heads/master@{#340383}


CrOS-Libchrome-Original-Commit: 15926f8886b8fa20c044c02eb0387f44e611c993
diff --git a/base/message_loop/incoming_task_queue.cc b/base/message_loop/incoming_task_queue.cc
index 5e9a461..eab14e9 100644
--- a/base/message_loop/incoming_task_queue.cc
+++ b/base/message_loop/incoming_task_queue.cc
@@ -147,7 +147,7 @@
   }
 
   // Initialize the sequence number. The sequence number is used for delayed
-  // tasks (to faciliate FIFO sorting when two tasks have the same
+  // tasks (to facilitate FIFO sorting when two tasks have the same
   // delayed_run_time value) and for identifying the task in about:tracing.
   pending_task->sequence_num = next_sequence_num_++;
 
diff --git a/base/message_loop/message_loop.cc b/base/message_loop/message_loop.cc
index 6bd6730..0ae13cb 100644
--- a/base/message_loop/message_loop.cc
+++ b/base/message_loop/message_loop.cc
@@ -44,7 +44,7 @@
 LazyInstance<base::ThreadLocalPointer<MessageLoop> >::Leaky lazy_tls_ptr =
     LAZY_INSTANCE_INITIALIZER;
 
-// Logical events for Histogram profiling. Run with -message-loop-histogrammer
+// Logical events for Histogram profiling. Run with --message-loop-histogrammer
 // to get an accounting of messages and actions taken on each thread.
 const int kTaskRunEvent = 0x1;
 #if !defined(OS_NACL)
@@ -56,9 +56,9 @@
 const int kNumberOfDistinctMessagesDisplayed = 1100;
 
 // Provide a macro that takes an expression (such as a constant, or macro
-// constant) and creates a pair to initalize an array of pairs.  In this case,
+// constant) and creates a pair to initialize an array of pairs.  In this case,
 // our pair consists of the expressions value, and the "stringized" version
-// of the expression (i.e., the exrpression put in quotes).  For example, if
+// of the expression (i.e., the expression put in quotes).  For example, if
 // we have:
 //    #define FOO 2
 //    #define BAR 5
@@ -79,7 +79,7 @@
   VALUE_TO_NUMBER_AND_NAME(kTaskRunEvent)
   VALUE_TO_NUMBER_AND_NAME(kTimerEvent)
 
-  {-1, NULL}  // The list must be null terminated, per API to histogram.
+  {-1, NULL}  // The list must be null-terminated, per API to histogram.
 };
 #endif  // !defined(OS_NACL)
 
@@ -362,7 +362,7 @@
 }
 
 bool MessageLoop::IsIdleForTesting() {
-  // We only check the imcoming queue|, since we don't want to lock the work
+  // We only check the incoming queue, since we don't want to lock the work
   // queue.
   return incoming_task_queue_->IsIdleForTesting();
 }
@@ -423,7 +423,7 @@
 
 void MessageLoop::SetThreadTaskRunnerHandle() {
   DCHECK_EQ(this, current());
-  // Clear the previous thread task runner first because only one can exist at
+  // Clear the previous thread task runner first, because only one can exist at
   // a time.
   thread_task_runner_handle_.reset();
   thread_task_runner_handle_.reset(new ThreadTaskRunnerHandle(task_runner_));
@@ -615,7 +615,7 @@
     return false;
   }
 
-  // When we "fall behind," there will be a lot of tasks in the delayed work
+  // When we "fall behind", there will be a lot of tasks in the delayed work
   // queue that are ready to run.  To increase efficiency when we fall behind,
   // we will only call Time::Now() intermittently, and then process all tasks
   // that are ready to run before calling it again.  As a result, the more we
diff --git a/base/message_loop/message_loop.h b/base/message_loop/message_loop.h
index fbb8309..63a29f1 100644
--- a/base/message_loop/message_loop.h
+++ b/base/message_loop/message_loop.h
@@ -308,18 +308,18 @@
   void SetTaskRunner(scoped_refptr<SingleThreadTaskRunner> task_runner);
 
   // Enables or disables the recursive task processing. This happens in the case
-  // of recursive message loops. Some unwanted message loop may occurs when
+  // of recursive message loops. Some unwanted message loops may occur when
   // using common controls or printer functions. By default, recursive task
   // processing is disabled.
   //
-  // Please utilize |ScopedNestableTaskAllower| instead of calling these methods
-  // directly.  In general nestable message loops are to be avoided.  They are
+  // Please use |ScopedNestableTaskAllower| instead of calling these methods
+  // directly.  In general, nestable message loops are to be avoided.  They are
   // dangerous and difficult to get right, so please use with extreme caution.
   //
   // The specific case where tasks get queued is:
   // - The thread is running a message loop.
-  // - It receives a task #1 and execute it.
-  // - The task #1 implicitly start a message loop, like a MessageBox in the
+  // - It receives a task #1 and executes it.
+  // - The task #1 implicitly starts a message loop, like a MessageBox in the
   //   unit test. This can also be StartDoc or GetSaveFileName.
   // - The thread receives a task #2 before or while in this second message
   //   loop.
@@ -420,7 +420,7 @@
   // and then pass it to the thread where the message loop actually runs.
   // The message loop's BindToCurrentThread() method must be called on the
   // thread the message loop runs on, before calling Run().
-  // Before BindToCurrentThread() is called only Post*Task() functions can
+  // Before BindToCurrentThread() is called, only Post*Task() functions can
   // be called on the message loop.
   static scoped_ptr<MessageLoop> CreateUnbound(
       Type type,
@@ -511,7 +511,7 @@
   bool nestable_tasks_allowed_;
 
 #if defined(OS_WIN)
-  // Should be set to true before calling Windows APIs like TrackPopupMenu, etc
+  // Should be set to true before calling Windows APIs like TrackPopupMenu, etc.
   // which enter a modal message loop.
   bool os_modal_loop_;
 #endif
diff --git a/base/message_loop/message_loop_task_runner_unittest.cc b/base/message_loop/message_loop_task_runner_unittest.cc
index caf88af..a0d84b7 100644
--- a/base/message_loop/message_loop_task_runner_unittest.cc
+++ b/base/message_loop/message_loop_task_runner_unittest.cc
@@ -30,7 +30,7 @@
  protected:
   void SetUp() override {
     // Use SetUp() instead of the constructor to avoid posting a task to a
-    // partialy constructed object.
+    // partially constructed object.
     task_thread_.Start();
 
     // Allow us to pause the |task_thread_|'s MessageLoop.
@@ -41,7 +41,7 @@
 
   void TearDown() override {
     // Make sure the |task_thread_| is not blocked, and stop the thread
-    // fully before destuction because its tasks may still depend on the
+    // fully before destruction because its tasks may still depend on the
     // |thread_sync_| event.
     thread_sync_.Signal();
     task_thread_.Stop();
@@ -244,7 +244,7 @@
   // it, we cannot just delete it because PostTaskAndReplyRelay's destructor
   // checks that MessageLoop::current() is the the same as when the
   // PostTaskAndReplyRelay object was constructed.  However, this loop must have
-  // aleady been deleted in order to perform this test.  See
+  // already been deleted in order to perform this test.  See
   // http://crbug.com/86301.
 }
 
diff --git a/base/message_loop/message_loop_unittest.cc b/base/message_loop/message_loop_unittest.cc
index 9c17017..89f9a40 100644
--- a/base/message_loop/message_loop_unittest.cc
+++ b/base/message_loop/message_loop_unittest.cc
@@ -119,7 +119,7 @@
       Bind(&RecordRunTimeFunc, &run_time, &num_tasks),
       TimeDelta::FromSeconds(1000));
 
-  // This slightly delayed task should run from within SubPumpFunc).
+  // This slightly delayed task should run from within SubPumpFunc.
   loop.PostDelayedTask(
       FROM_HERE,
       Bind(&PostQuitMessage, 0),
@@ -600,7 +600,7 @@
   TestIOHandler handler2(kPipeName2, callback2_called.Get(), true);
   thread_loop->PostTask(FROM_HERE, Bind(&TestIOHandler::Init,
                                               Unretained(&handler1)));
-  // TODO(ajwong): Do we really need such long Sleeps in ths function?
+  // TODO(ajwong): Do we really need such long Sleeps in this function?
   // Make sure the thread runs and sleeps for lack of work.
   TimeDelta delay = TimeDelta::FromMilliseconds(100);
   PlatformThread::Sleep(delay);
@@ -645,7 +645,7 @@
   RunTest_PostDelayedTask_SharedTimer_SubPump();
 }
 
-// This test occasionally hangs http://crbug.com/44567
+// This test occasionally hangs. See http://crbug.com/44567.
 TEST(MessageLoopTest, DISABLED_RecursiveDenial2) {
   RunTest_RecursiveDenial2(MessageLoop::TYPE_DEFAULT);
   RunTest_RecursiveDenial2(MessageLoop::TYPE_UI);
@@ -653,7 +653,7 @@
 }
 
 TEST(MessageLoopTest, RecursiveSupport2) {
-  // This test requires a UI loop
+  // This test requires a UI loop.
   RunTest_RecursiveSupport2(MessageLoop::TYPE_UI);
 }
 #endif  // defined(OS_WIN)
diff --git a/base/message_loop/message_pump_glib.cc b/base/message_loop/message_pump_glib.cc
index f06f60d..fd23745 100644
--- a/base/message_loop/message_pump_glib.cc
+++ b/base/message_loop/message_pump_glib.cc
@@ -52,7 +52,7 @@
 // returns FALSE, GLib will destroy the source.  Dispatch calls may be recursive
 // (i.e., you can call Run from them), but Prepare and Check cannot.
 //     Finalize is called when the source is destroyed.
-// NOTE: It is common for subsytems to want to process pending events while
+// NOTE: It is common for subsystems to want to process pending events while
 // doing intensive work, for example the flash plugin. They usually use the
 // following pattern (recommended by the GTK docs):
 // while (gtk_events_pending()) {
@@ -350,7 +350,7 @@
 
 void MessagePumpGlib::ScheduleDelayedWork(const TimeTicks& delayed_work_time) {
   // We need to wake up the loop in case the poll timeout needs to be
-  // adjusted.  This will cause us to try to do work, but that's ok.
+  // adjusted.  This will cause us to try to do work, but that's OK.
   delayed_work_time_ = delayed_work_time;
   ScheduleWork();
 }