Add multi-planar functions to GpuMemoryBuffer

content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc

Index: content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc b/content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc
index e8ac048e15d79994ffba7017424c0f6ee753c5ae..4af6b160ddde79a1b2e7928eb33bae74954c6aae 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc
+++ b/content/common/gpu/client/gpu_memory_buffer_impl_io_surface.cc
@@ -35,21 +35,26 @@ scoped_ptr<GpuMemoryBufferImpl> GpuMemoryBufferImplIOSurface::CreateFromHandle(
       handle.id, size, format, callback, io_surface.release()));
 }
 
-void* GpuMemoryBufferImplIOSurface::Map() {
+bool GpuMemoryBufferImplIOSurface::Map(void** data) {
   DCHECK(!mapped_);
+  DCHECK_EQ(num_planes_, 1u);
   IOSurfaceLock(io_surface_, 0, NULL);
   mapped_ = true;
-  return IOSurfaceGetBaseAddress(io_surface_);
+  data[0] = IOSurfaceGetBaseAddress(io_surface_);
+  return true;
 }
 
+
 void GpuMemoryBufferImplIOSurface::Unmap() {
   DCHECK(mapped_);
   IOSurfaceUnlock(io_surface_, 0, NULL);
   mapped_ = false;
 }
 
-uint32 GpuMemoryBufferImplIOSurface::GetStride() const {
-  return IOSurfaceGetBytesPerRow(io_surface_);
+bool GpuMemoryBufferImplIOSurface::GetStride(uint32* stride) const {
+  DCHECK_EQ(num_planes_, 1u);
+  stride[0] = IOSurfaceGetBytesPerRow(io_surface_);
+  return true;
 }
 
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplIOSurface::GetHandle() const {