Add multi-planar functions to GpuMemoryBuffer

content/common/gpu/client/gpu_memory_buffer_impl_surface_texture.cc

Index: content/common/gpu/client/gpu_memory_buffer_impl_surface_texture.cc
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl_surface_texture.cc b/content/common/gpu/client/gpu_memory_buffer_impl_surface_texture.cc
index 440dbfcec4b9b4ece5f37f28e43442902624c11b..9f21097d0f1f0e81d977e278a17a5d177440d8f1 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl_surface_texture.cc
+++ b/content/common/gpu/client/gpu_memory_buffer_impl_surface_texture.cc
@@ -90,6 +90,12 @@ void* GpuMemoryBufferImplSurfaceTexture::Map() {
   return buffer.bits;
 }
 
+void* GpuMemoryBufferImplSurfaceTexture::Map(size_t plane_index) {
+  if (plane_index >= num_planes_)
+    return NULL;
+  return Map();
+}
+
 void GpuMemoryBufferImplSurfaceTexture::Unmap() {
   TRACE_EVENT0("gpu", "GpuMemoryBufferImplSurfaceTexture::Unmap");
 
@@ -102,6 +108,12 @@ uint32 GpuMemoryBufferImplSurfaceTexture::GetStride() const {
   return stride_;
 }
 
+uint32 GpuMemoryBufferImplSurfaceTexture::GetStride(size_t plane_index) const {
+  if (plane_index >= num_planes_)
+    return 0;
+  return GetStride();
+}
+
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplSurfaceTexture::GetHandle()
     const {
   gfx::GpuMemoryBufferHandle handle;