Revert "Reland "SkSurface asynchronous read APIs allow client to extend pixel lifetime""

This reverts commit 6fc04f88a89ed2c9a1b4aa48bcd28602a69a457b.

Reason for revert: Chrome roll failure suspect because of:
* https://chromium-review.googlesource.com/c/chromium/src/+/1837131 (22 commits)
* https://chromium-review.googlesource.com/c/chromium/src/+/1837214 (24 commits)

Original change's description:
> Reland "SkSurface asynchronous read APIs allow client to extend pixel lifetime"
>
> This is a reland of ce240cc6fd8ec95bd051c7df2173dad2ae8f6ad6
>
> Original change's description:
> > SkSurface asynchronous read APIs allow client to extend pixel lifetime
> >
> > Previously the pixel data passed to the client was only valid during
> > the client's callback. This meant if the client wanted to defer
> > processing of the data a copy was necessary.
> >
> > Now we pass an object to the callback and the pixel lifetime is tied
> > to the lifetime of that object.
> >
> > The object may be holding a GPU transfer buffer mapped. We don't assume
> > that the object will be released on the direct GrContext thread. So
> > when the object is destroyed it posts a message to a new type,
> > GrClientMappedBufferManager, hanging off the direct context. The direct
> > context will periodically check for messages and unmap and then unref
> > buffers so that they can be reused. Currently this is done in
> > GrContext::performDeferredCleanup() and GrDrawingManager::flush().
> >
> > The old API is kept around for backwards compatibility but it is
> > reimplemented as a bridge on top of the new mechanism.
> >
> > Also a utility function to SkImageInfo is added to directly make a new
> > info with a specified dimensions rather than passing the width and
> > height separately to makeWH().
> >
> > Bug: chromium:973403
> > Bug: skia:8962
> >
> > Change-Id: Id5cf04235376170142a48e90d3ecd13fd021a2a6
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/245457
> > Reviewed-by: Brian Osman <brianosman@google.com>
> > Commit-Queue: Brian Salomon <bsalomon@google.com>
>
> Bug: chromium:973403, skia:8962
> Change-Id: I5cecd36276c8b6dc942cf549c7095db2df88530c
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/245678
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,brianosman@google.com

Change-Id: I9e01d1b82fb399b94292441d91da51176bb161d9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:973403, skia:8962
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/245956
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 7319ba5..a41922d 100644
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -5,15 +5,13 @@
  * found in the LICENSE file.
  */
 
-#include "include/gpu/GrContext.h"
-
 #include "include/core/SkTraceMemoryDump.h"
 #include "include/gpu/GrBackendSemaphore.h"
+#include "include/gpu/GrContext.h"
 #include "include/private/SkDeferredDisplayList.h"
 #include "include/private/SkImageInfoPriv.h"
 #include "src/core/SkMakeUnique.h"
 #include "src/core/SkTaskGroup.h"
-#include "src/gpu/GrClientMappedBufferManager.h"
 #include "src/gpu/GrDrawingManager.h"
 #include "src/gpu/GrGpu.h"
 #include "src/gpu/GrMemoryPool.h"
@@ -33,6 +31,7 @@
 #include "src/gpu/text/GrTextContext.h"
 #include "src/image/SkSurface_Gpu.h"
 #include <atomic>
+#include <unordered_map>
 
 #define ASSERT_OWNED_PROXY(P) \
     SkASSERT(!(P) || !((P)->peekTexture()) || (P)->peekTexture()->getContext() == this)
@@ -98,8 +97,6 @@
         fShaderErrorHandler = GrShaderUtils::DefaultShaderErrorHandler();
     }
 
-    fMappedBufferManager = skstd::make_unique<GrClientMappedBufferManager>();
-
     return true;
 }
 
@@ -116,8 +113,6 @@
 
     INHERITED::abandonContext();
 
-    fMappedBufferManager->abandon();
-
     fResourceProvider->abandon();
 
     // Need to cleanup the drawing manager first so all the render targets
@@ -129,8 +124,6 @@
     fResourceCache->abandonAll();
 
     fGpu->disconnect(GrGpu::DisconnectType::kAbandon);
-
-    fMappedBufferManager.reset();
 }
 
 void GrContext::releaseResourcesAndAbandonContext() {
@@ -140,8 +133,6 @@
 
     INHERITED::abandonContext();
 
-    fMappedBufferManager.reset();
-
     fResourceProvider->abandon();
 
     // Need to cleanup the drawing manager first so all the render targets
@@ -193,11 +184,6 @@
 
     ASSERT_SINGLE_OWNER
 
-    if (this->abandoned()) {
-        return;
-    }
-
-    fMappedBufferManager->process();
     auto purgeTime = GrStdSteadyClock::now() - msNotUsed;
 
     fResourceCache->purgeAsNeeded();