Update GPU memory buffers to use StrideInBytes internally.

content/common/gpu/gpu_memory_buffer_factory_io_surface.cc

Index: content/common/gpu/gpu_memory_buffer_factory_io_surface.cc
diff --git a/content/common/gpu/gpu_memory_buffer_factory_io_surface.cc b/content/common/gpu/gpu_memory_buffer_factory_io_surface.cc
index ba00ea2553a2600002baee58b12b5ee9cdb9a4c0..d8bb4e7033c98de9f59ee04accf0dee2db77cffd 100644
--- a/content/common/gpu/gpu_memory_buffer_factory_io_surface.cc
+++ b/content/common/gpu/gpu_memory_buffer_factory_io_surface.cc
@@ -94,6 +94,8 @@ GpuMemoryBufferFactoryIOSurface::CreateGpuMemoryBuffer(
     gfx::GpuMemoryBuffer::Usage usage,
     int client_id,
     gfx::PluginWindowHandle surface_handle) {
+  size_t bits_per_pixel = GpuMemoryBufferImpl::BitsPerPixel(format);
+  DCHECK_EQ(bits_per_pixel % 8, 0u);
   base::ScopedCFTypeRef<CFMutableDictionaryRef> properties;
   properties.reset(CFDictionaryCreateMutable(kCFAllocatorDefault,
                                              0,
@@ -101,7 +103,7 @@ GpuMemoryBufferFactoryIOSurface::CreateGpuMemoryBuffer(
                                              &kCFTypeDictionaryValueCallBacks));
   AddIntegerValue(properties, kIOSurfaceWidth, size.width());
   AddIntegerValue(properties, kIOSurfaceHeight, size.height());
-  AddIntegerValue(properties, kIOSurfaceBytesPerElement, BytesPerPixel(format));
+  AddIntegerValue(properties, kIOSurfaceBytesPerElement, bits_per_pixel / 8);
   AddIntegerValue(properties, kIOSurfacePixelFormat, PixelFormat(format));
   // TODO(reveman): Remove this when using a mach_port_t to transfer
   // IOSurface to browser and renderer process. crbug.com/323304