Add PERSISTENT_MAP usage for GpuMemoryBuffers.

content/browser/compositor/gpu_process_transport_factory.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/compositor/gpu_process_transport_factory.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 384 matching lines @@
 
     helper.reset();
     DCHECK(!gl_helper_) << "Destroying the GLHelper should not cause a new "
                            "GLHelper to be created.";
   }
 }
 
 bool GpuProcessTransportFactory::DoesCreateTestContexts() { return false; }
 
 uint32 GpuProcessTransportFactory::GetImageTextureTarget() {
-  return BrowserGpuChannelHostFactory::GetImageTextureTarget();
+  // TODO(reveman): We currently assume that the compositor will use BGRA_8888
+  // if it's able to, and RGBA_8888 otherwise. Since we don't know what it will
+  // use we hardcode BGRA_8888 here for now. We should instead
+  // move decisions about GpuMemoryBuffer format to the browser embedder so we
+  // know it here, and pass that decision to the compositor for each usage.
+  gfx::GpuMemoryBuffer::Format format = gfx::GpuMemoryBuffer::BGRA_8888;
+
+  // TODO(danakj): When one-copy uploads support partial update, change this
+  // usage to PERSISTENT_MAP for one-copy.
+  gfx::GpuMemoryBuffer::Usage usage = gfx::GpuMemoryBuffer::MAP;
+
+  return BrowserGpuChannelHostFactory::GetImageTextureTarget(format, usage);
 }
 
 cc::SharedBitmapManager* GpuProcessTransportFactory::GetSharedBitmapManager() {
   return HostSharedBitmapManager::current();
 }
 
 gpu::GpuMemoryBufferManager*
 GpuProcessTransportFactory::GetGpuMemoryBufferManager() {
   return BrowserGpuMemoryBufferManager::current();
 }
@@ skipping 187 matching lines @@
   FOR_EACH_OBSERVER(ImageTransportFactoryObserver,
                     observer_list_,
                     OnLostResources());
 
   // Kill things that use the shared context before killing the shared context.
   lost_gl_helper.reset();
   lost_shared_main_thread_contexts  = NULL;
 }
 
 }  // namespace content