Add multi-planar functions to GpuMemoryBuffer

content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc

Index: content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc b/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc
index 8daff2a9b80c53572bfb969572d0e4b691ca5535..567b5435c9a3af954516e2b769a71cc72cbf40ed 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc
+++ b/content/common/gpu/client/gpu_memory_buffer_impl_shared_memory.cc
@@ -162,6 +162,12 @@ void* GpuMemoryBufferImplSharedMemory::Map() {
   return shared_memory_->memory();
 }
 
+void* GpuMemoryBufferImplSharedMemory::Map(size_t plane_index) {
+  if (plane_index >= num_planes_)
+    return NULL;
+  return Map();
+}
+
 void GpuMemoryBufferImplSharedMemory::Unmap() {
   DCHECK(mapped_);
   mapped_ = false;
@@ -174,6 +180,12 @@ uint32 GpuMemoryBufferImplSharedMemory::GetStride() const {
   return stride_in_bytes;
 }
 
+uint32 GpuMemoryBufferImplSharedMemory::GetStride(size_t plane_index) const {
+  if (plane_index >= num_planes_)
+    return 0;
+  return GetStride();
+}
+
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplSharedMemory::GetHandle() const {
   gfx::GpuMemoryBufferHandle handle;
   handle.type = gfx::SHARED_MEMORY_BUFFER;