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..d4894c8d3934a0a8aa62bfaa739d9b717ba014c5 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
@@ -156,10 +156,12 @@ bool GpuMemoryBufferImplSharedMemory::IsSizeValidForFormat(
   return false;
 }
 
-void* GpuMemoryBufferImplSharedMemory::Map() {
+bool GpuMemoryBufferImplSharedMemory::Map(void** data) {
   DCHECK(!mapped_);
+  DCHECK_EQ(num_planes_, 1u);
   mapped_ = true;
-  return shared_memory_->memory();
+  data[0] = shared_memory_->memory();
+  return true;
 }
 
 void GpuMemoryBufferImplSharedMemory::Unmap() {
@@ -167,11 +169,13 @@ void GpuMemoryBufferImplSharedMemory::Unmap() {
   mapped_ = false;
 }
 
-uint32 GpuMemoryBufferImplSharedMemory::GetStride() const {
+bool GpuMemoryBufferImplSharedMemory::GetStride(uint32* stride) const {
+  DCHECK_EQ(num_planes_, 1u);
   size_t stride_in_bytes = 0;
   bool valid_stride = StrideInBytes(size_.width(), format_, &stride_in_bytes);
   DCHECK(valid_stride);
-  return stride_in_bytes;
+  stride[0] = stride_in_bytes;
+  return valid_stride;
 }
 
 gfx::GpuMemoryBufferHandle GpuMemoryBufferImplSharedMemory::GetHandle() const {