Finish migrating to BroadcastDispatcher

This CL migrates most of the remaining classes to use
BroadcastDispatcher. Some classes left are Views or created before the
BroadcastDispatcher can be injected.

Adds docs for instructions on using the BroadcastDispatcher.

Using the broadcast dispatcher, the time system_server spends
dispatching common intents to SystemUI like SCREEN_OFF and SCREEN_ON can
be seen to decrease from ~70-150ms (in a Q build) to ~2-4ms.

Additionally, once a broadcast is received by the dispatcher, time
until it is fully dispatched inside SystemUI is not impacted greatly.
Most broadcasts are fully dispatched after ~20ms with a few of them
taking ~100ms.

Test: atest SystemUITests no regressions
Test: build and boot
Test: tried some random broadcasts and they are properly dispatched
Test: BroadcastDispatch dump
Test: adb shell dumpsys activity broadcasts
Bug: 134566046

Change-Id: I26a592be66b053f25669b5481b58bf7f07bfd0da
diff --git a/packages/SystemUI/src/com/android/systemui/pip/phone/PipManager.java b/packages/SystemUI/src/com/android/systemui/pip/phone/PipManager.java
index 369073c..c33b8d9 100644
--- a/packages/SystemUI/src/com/android/systemui/pip/phone/PipManager.java
+++ b/packages/SystemUI/src/com/android/systemui/pip/phone/PipManager.java
@@ -37,6 +37,7 @@
 
 import com.android.systemui.Dependency;
 import com.android.systemui.UiOffloadThread;
+import com.android.systemui.broadcast.BroadcastDispatcher;
 import com.android.systemui.pip.BasePipManager;
 import com.android.systemui.pip.PipBoundsHandler;
 import com.android.systemui.shared.system.ActivityManagerWrapper;
@@ -200,7 +201,7 @@
     /**
      * Initializes {@link PipManager}.
      */
-    public void initialize(Context context) {
+    public void initialize(Context context, BroadcastDispatcher broadcastDispatcher) {
         mContext = context;
         mActivityManager = ActivityManager.getService();
         mActivityTaskManager = ActivityTaskManager.getService();
@@ -214,7 +215,7 @@
 
         mPipBoundsHandler = new PipBoundsHandler(context);
         mInputConsumerController = InputConsumerController.getPipInputConsumer();
-        mMediaController = new PipMediaController(context, mActivityManager);
+        mMediaController = new PipMediaController(context, mActivityManager, broadcastDispatcher);
         mMenuController = new PipMenuActivityController(context, mActivityManager, mMediaController,
                 mInputConsumerController);
         mTouchHandler = new PipTouchHandler(context, mActivityManager, mActivityTaskManager,