Add multi-planar functions to GpuMemoryBuffer

cc/resources/one_copy_tile_task_worker_pool.cc

Index: cc/resources/one_copy_tile_task_worker_pool.cc
diff --git a/cc/resources/one_copy_tile_task_worker_pool.cc b/cc/resources/one_copy_tile_task_worker_pool.cc
index 1139fbeb507bc2aeb9f91d9f5e4e056c4c32eccf..998dc262685e453ec709db17189c6fa08bf8a581 100644
--- a/cc/resources/one_copy_tile_task_worker_pool.cc
+++ b/cc/resources/one_copy_tile_task_worker_pool.cc
@@ -321,9 +321,20 @@ OneCopyTileTaskWorkerPool::PlaybackAndScheduleCopyOnWorkerThread(
 
     gfx::GpuMemoryBuffer* gpu_memory_buffer = write_lock->GetGpuMemoryBuffer();
     if (gpu_memory_buffer) {
-      TileTaskWorkerPool::PlaybackToMemory(
-          gpu_memory_buffer->Map(), src->format(), src->size(),
-          gpu_memory_buffer->GetStride(), raster_source, rect, scale);
+      size_t num_buffers = gpu_memory_buffer->GetNumberOfPlanes();

[reveman, 2015/03/23 22:24:00]

This code is for contents tile textures. I don't think it makes sense to support
multiple planes here. You can just do something like:

void *data = NULL;
bool rv = gpu_memory_buffer->Map(&data);
CHECK(rv);
uint32 stride;
gpu_memory_buffer->GetStride(&stride);
TileTaskWorkerPool::PlaybackToMemory(data, src->format(), src->size(), stride,
...);
gpu_memory_buffer->Unmap();

[emircan, 2015/03/24 16:52:26]

Done.

+      DCHECK_EQ(num_buffers, 1u);
+
+      void* mapped_buffers[num_buffers];
+      bool map_completed = gpu_memory_buffer->Map(mapped_buffers);
+      DCHECK(map_completed);
+
+      uint32 strides[num_buffers];
+      bool getStride_completed = gpu_memory_buffer->GetStride(strides);
+      DCHECK(getStride_completed);
+
+      TileTaskWorkerPool::PlaybackToMemory(mapped_buffers[0], src->format(),
+                                           src->size(), strides[0],
+                                           raster_source, rect, scale);
       gpu_memory_buffer->Unmap();
     }
   }