Add multi-planar functions to GpuMemoryBuffer

content/common/gpu/client/gpu_memory_buffer_impl.h

Index: content/common/gpu/client/gpu_memory_buffer_impl.h
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl.h b/content/common/gpu/client/gpu_memory_buffer_impl.h
index 61800c80f482d69ba4e2a6f0f5f01c0963232908..0283da7ffc6e2db6b2ac6edea407aaac1b70c4c2 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl.h
+++ b/content/common/gpu/client/gpu_memory_buffer_impl.h
@@ -39,8 +39,13 @@ class CONTENT_EXPORT GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
                             Format format,
                             size_t* stride_in_bytes);
 
+  // Returns the number of planes based on the format of the buffer.
+  static size_t NumberOfPlanesForGpuMemoryBufferFormat(
+      gfx::GpuMemoryBuffer::Format format);
+
   // Overridden from gfx::GpuMemoryBuffer:
   bool IsMapped() const override;
+  size_t GetNumberOfPlanes() const override;
   Format GetFormat() const override;
   ClientBuffer AsClientBuffer() override;
 
@@ -57,11 +62,13 @@ class CONTENT_EXPORT GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
   const gfx::GpuMemoryBufferId id_;
   const gfx::Size size_;
   const Format format_;
+  const size_t num_planes_;
   const DestructionCallback callback_;
   bool mapped_;
   uint32 destruction_sync_point_;
 
  private:
+
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImpl);
 };