Update GPU memory buffers to use StrideInBytes internally.

content/common/gpu/gpu_memory_buffer_factory_shared_memory.cc

 // Copyright 2014 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/gpu_memory_buffer_factory_shared_memory.h"
 
 #include "base/logging.h"
 #include "content/common/gpu/client/gpu_memory_buffer_impl.h"
 #include "ui/gl/gl_image.h"
 #include "ui/gl/gl_image_shared_memory.h"
@@ skipping 20 matching lines @@
 
 gfx::GpuMemoryBufferHandle
 GpuMemoryBufferFactorySharedMemory::CreateGpuMemoryBuffer(
     gfx::GpuMemoryBufferId id,
     const gfx::Size& size,
     gfx::GpuMemoryBuffer::Format format,
     gfx::GpuMemoryBuffer::Usage usage,
     int client_id,
     gfx::PluginWindowHandle surface_handle) {
   base::SharedMemory shared_memory;
-  if (!shared_memory.CreateAnonymous(
-          size.GetArea() * GpuMemoryBufferImpl::BytesPerPixel(format)))
+
+  size_t stride_in_bytes = 0;
+  if (!GpuMemoryBufferImpl::StrideInBytes(
+          size.width(), format, &stride_in_bytes))
+    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()))
     return gfx::GpuMemoryBufferHandle();
 
   gfx::GpuMemoryBufferHandle handle;
   handle.type = gfx::SHARED_MEMORY_BUFFER;
   handle.id = id;
   shared_memory.ShareToProcess(base::GetCurrentProcessHandle(), &handle.handle);
   return handle;
 }
 
 void GpuMemoryBufferFactorySharedMemory::DestroyGpuMemoryBuffer(
@@ skipping 14 matching lines @@
     int client_id) {
   scoped_refptr<gfx::GLImageSharedMemory> image(
       new gfx::GLImageSharedMemory(size, internalformat));
   if (!image->Initialize(handle, format))
     return scoped_refptr<gfx::GLImage>();
 
   return image;
 }
 
 }  // namespace content