Add multi-planar functions to GpuMemoryBuffer

cc/resources/zero_copy_tile_task_worker_pool.cc

Index: cc/resources/zero_copy_tile_task_worker_pool.cc
diff --git a/cc/resources/zero_copy_tile_task_worker_pool.cc b/cc/resources/zero_copy_tile_task_worker_pool.cc
index 8b80aa3292207d48f52c5033bb2b121fec3b9441..4529ad648e426aed53ae9bee59e971915c3c95f0 100644
--- a/cc/resources/zero_copy_tile_task_worker_pool.cc
+++ b/cc/resources/zero_copy_tile_task_worker_pool.cc
@@ -31,9 +31,20 @@ class RasterBufferImpl : public RasterBuffer {
     if (!gpu_memory_buffer)
       return;
 
-    TileTaskWorkerPool::PlaybackToMemory(
-        gpu_memory_buffer->Map(), resource_->format(), resource_->size(),
-        gpu_memory_buffer->GetStride(), raster_source, rect, scale);
+    size_t num_buffers = gpu_memory_buffer->GetNumberOfPlanes();

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

Same here. No need to support multi-plane formats.

[reveman, 2015/03/23 22:24:01]

Same here. This code can assume one plane.

[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], resource_->format(),
+                                         resource_->size(), strides[0],
+                                         raster_source, rect, scale);
     gpu_memory_buffer->Unmap();
   }