Add CHECKs when a single GpuMemoryBuffer plane is assumed

cc/raster/one_copy_tile_task_worker_pool.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 "cc/raster/one_copy_tile_task_worker_pool.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/base/math_util.h"
 #include "cc/debug/traced_value.h"
 #include "cc/raster/raster_buffer.h"
 #include "cc/resources/platform_color.h"
 #include "cc/resources/resource_pool.h"
 #include "cc/resources/scoped_resource.h"
 #include "gpu/command_buffer/client/gles2_interface.h"
+#include "ui/gfx/buffer_format_util.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
 namespace cc {
 namespace {
 
 class RasterBufferImpl : public RasterBuffer {
  public:
   RasterBufferImpl(OneCopyTileTaskWorkerPool* worker_pool,
                    ResourceProvider* resource_provider,
                    ResourcePool* resource_pool,
@@ skipping 301 matching lines @@
     const Resource* raster_resource,
     const Resource* output_resource,
     const RasterSource* raster_source,
     const gfx::Rect& raster_full_rect,
     const gfx::Rect& raster_dirty_rect,
     float scale,
     bool include_images) {
   gfx::GpuMemoryBuffer* gpu_memory_buffer =
       raster_resource_write_lock->GetGpuMemoryBuffer();
   if (gpu_memory_buffer) {
+    DCHECK_EQ(
+        1u, gfx::NumberOfPlanesForBufferFormat(gpu_memory_buffer->GetFormat()));
     void* data = NULL;
     bool rv = gpu_memory_buffer->Map(&data);
     DCHECK(rv);
     int stride;
     gpu_memory_buffer->GetStride(&stride);
     // TileTaskWorkerPool::PlaybackToMemory only supports unsigned strides.
     DCHECK_GE(stride, 0);
 
     gfx::Rect playback_rect = raster_full_rect;
     if (reusing_raster_resource) {
@@ skipping 232 matching lines @@
       "pending_copy_count",
       static_cast<int>(resource_pool_->total_resource_count() -
                        resource_pool_->acquired_resource_count()));
   staging_state->SetInteger(
       "bytes_pending_copy",
       static_cast<int>(resource_pool_->total_memory_usage_bytes() -
                        resource_pool_->acquired_memory_usage_bytes()));
 }
 
 }  // namespace cc