Add gfx::GpuMemoryBuffer::YUV_420 and GpuMemoryBufferImplSharedMemory support

content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc

Index: content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc
diff --git a/content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc b/content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc
index 790fcab9f8ae4bfcda1daba8d4b1638a446cdb03..e82a15c38e44ebc73a9af9d7bed2ad5d6d18c897 100644
--- a/content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc
+++ b/content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc
@@ -24,7 +24,8 @@ void GpuMemoryBufferFactorySharedMemory::
         std::vector<Configuration>* configurations) {
   const Configuration supported_configurations[] = {
     { gfx::GpuMemoryBuffer::RGBA_8888, gfx::GpuMemoryBuffer::MAP },
-    { gfx::GpuMemoryBuffer::BGRA_8888, gfx::GpuMemoryBuffer::MAP }
+    { gfx::GpuMemoryBuffer::BGRA_8888, gfx::GpuMemoryBuffer::MAP },
+    { gfx::GpuMemoryBuffer::YUV_420, gfx::GpuMemoryBuffer::MAP }
   };
   configurations->assign(
       supported_configurations,
@@ -39,19 +40,12 @@ GpuMemoryBufferFactorySharedMemory::CreateGpuMemoryBuffer(
     gfx::GpuMemoryBuffer::Usage usage,
     int client_id,
     gfx::PluginWindowHandle surface_handle) {
-  base::SharedMemory shared_memory;
-
-  size_t stride_in_bytes = 0;
-  if (!GpuMemoryBufferImpl::StrideInBytes(
-          size.width(), format, &stride_in_bytes))
+  size_t buffer_size = 0u;
+  if (!GpuMemoryBufferImpl::BufferSizeInBytes(size, format, &buffer_size))
     return gfx::GpuMemoryBufferHandle();
 
-  base::CheckedNumeric<size_t> size_in_bytes = stride_in_bytes;
-  size_in_bytes *= size.height();
-  if (!size_in_bytes.IsValid())
-    return gfx::GpuMemoryBufferHandle();
-
-  if (!shared_memory.CreateAnonymous(size_in_bytes.ValueOrDie()))
+  base::SharedMemory shared_memory;
+  if (!shared_memory.CreateAnonymous(buffer_size))
     return gfx::GpuMemoryBufferHandle();
 
   gfx::GpuMemoryBufferHandle handle;