Update GPU memory buffers to use StrideInBytes internally.

ui/gl/gl_image_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 "ui/gl/gl_image_shared_memory.h"
 
 #include "base/logging.h"
 #include "base/numerics/safe_math.h"
 #include "base/process/process_handle.h"
 
 namespace gfx {
 namespace {
 
 // Returns true if the size is valid and false otherwise.
 bool SizeInBytes(const gfx::Size& size,
                  gfx::GpuMemoryBuffer::Format format,
                  size_t* size_in_bytes) {
   if (size.IsEmpty())
     return false;
-  base::CheckedNumeric<size_t> s = GLImageMemory::BytesPerPixel(format);
-  s *= size.width();
+  base::CheckedNumeric<size_t> s =
+      GLImageMemory::StrideInBytes(size.width(), format);
   s *= size.height();
   if (!s.IsValid())
     return false;
   *size_in_bytes = s.ValueOrDie();
   return true;
 }
 
 }  // namespace
 
 GLImageSharedMemory::GLImageSharedMemory(const gfx::Size& size,
@@ skipping 40 matching lines @@
   shared_memory_ = duped_shared_memory.Pass();
   return true;
 }
 
 void GLImageSharedMemory::Destroy(bool have_context) {
   GLImageMemory::Destroy(have_context);
   shared_memory_.reset();
 }
 
 }  // namespace gfx