Add multi-planar functions to GpuMemoryBuffer

content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/common/gpu/client/gpu_memory_buffer_impl_io_surface.h"
 
 #include "base/logging.h"
 
 namespace content {
 
@@ skipping 24 matching lines @@
       handle.id, size, format, callback, io_surface.release()));
 }
 
 void* GpuMemoryBufferImplIOSurface::Map() {
   DCHECK(!mapped_);
   IOSurfaceLock(io_surface_, 0, NULL);
   mapped_ = true;
   return IOSurfaceGetBaseAddress(io_surface_);
 }
 
+void* GpuMemoryBufferImplIOSurface::Map(size_t plane_index) {
+  if (plane_index >= num_planes_)
+    return NULL;
+  return Map();
+}
+
 void GpuMemoryBufferImplIOSurface::Unmap() {
   DCHECK(mapped_);
   IOSurfaceUnlock(io_surface_, 0, NULL);
   mapped_ = false;
 }
 
 uint32 GpuMemoryBufferImplIOSurface::GetStride() const {
   return IOSurfaceGetBytesPerRow(io_surface_);
 }
 
+uint32 GpuMemoryBufferImplIOSurface::GetStride(size_t plane_index) const {
+  if (plane_index >= num_planes_)
+    return 0;
+  return GetStride();
+}
+
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplIOSurface::GetHandle() const {
   gfx::GpuMemoryBufferHandle handle;
   handle.type = gfx::IO_SURFACE_BUFFER;
   handle.id = id_;
   handle.io_surface_id = IOSurfaceGetID(io_surface_);
   return handle;
 }
 
 }  // namespace content