Add R_8 GPU memory buffers format.

content/common/gpu/client/gpu_memory_buffer_impl_surface_texture.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/common/gpu/client/gpu_memory_buffer_impl_surface_texture.h"
 
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
 #include "content/common/android/surface_texture_manager.h"
 #include "ui/gl/gl_bindings.h"
 
 namespace content {
 namespace {
 
 int WindowFormat(gfx::GpuMemoryBuffer::Format format) {
   switch (format) {
     case gfx::GpuMemoryBuffer::RGBA_8888:
       return WINDOW_FORMAT_RGBA_8888;
     case gfx::GpuMemoryBuffer::ATC:
     case gfx::GpuMemoryBuffer::ATCIA:
     case gfx::GpuMemoryBuffer::DXT1:
     case gfx::GpuMemoryBuffer::DXT5:
     case gfx::GpuMemoryBuffer::ETC1:
+    case gfx::GpuMemoryBuffer::R_8:
     case gfx::GpuMemoryBuffer::RGBX_8888:
     case gfx::GpuMemoryBuffer::BGRA_8888:
       NOTREACHED();
       return 0;
   }
 
   NOTREACHED();
   return 0;
 }
 
@@ skipping 71 matching lines @@
 
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplSurfaceTexture::GetHandle()
     const {
   gfx::GpuMemoryBufferHandle handle;
   handle.type = gfx::SURFACE_TEXTURE_BUFFER;
   handle.id = id_;
   return handle;
 }
 
 }  // namespace content