Add CHECKs when a single GpuMemoryBuffer plane is assumed

cc/raster/zero_copy_tile_task_worker_pool.cc

 // Copyright 2013 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/zero_copy_tile_task_worker_pool.h"
 
 #include <algorithm>
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/debug/traced_value.h"
 #include "cc/raster/raster_buffer.h"
 #include "cc/resources/platform_color.h"
 #include "cc/resources/resource.h"
+#include "ui/gfx/buffer_format_util.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
 namespace cc {
 namespace {
 
 class RasterBufferImpl : public RasterBuffer {
  public:
   RasterBufferImpl(ResourceProvider* resource_provider,
                    const Resource* resource)
       : lock_(resource_provider, resource->id()), resource_(resource) {}
 
   // Overridden from RasterBuffer:
   void Playback(const RasterSource* raster_source,
                 const gfx::Rect& raster_full_rect,
                 const gfx::Rect& raster_dirty_rect,
                 uint64_t new_content_id,
                 float scale,
                 bool include_images) override {
     gfx::GpuMemoryBuffer* gpu_memory_buffer = lock_.GetGpuMemoryBuffer();
     if (!gpu_memory_buffer)
       return;
+    CHECK_EQ(
+        1u, gfx::NumberOfPlanesForBufferFormat(gpu_memory_buffer->GetFormat()));

[reveman, 2015/08/11 18:59:11]

nit: DCHECK_EQ

[Andre, 2015/08/11 19:37:53]

Done.

     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);
     // TODO(danakj): Implement partial raster with raster_dirty_rect.
     TileTaskWorkerPool::PlaybackToMemory(
         data, resource_->format(), resource_->size(),
@@ skipping 173 matching lines @@
       new base::trace_event::TracedValue();
 
   state->BeginArray("tasks_pending");
   for (TaskSet task_set = 0; task_set < kNumberOfTaskSets; ++task_set)
     state->AppendBoolean(tasks_pending_[task_set]);
   state->EndArray();
   return state;
 }
 
 }  // namespace cc