Update GPU memory buffers to use StrideInBytes internally.

content/common/gpu/client/gpu_memory_buffer_impl.h

Index: content/common/gpu/client/gpu_memory_buffer_impl.h
diff --git a/content/common/gpu/client/gpu_memory_buffer_impl.h b/content/common/gpu/client/gpu_memory_buffer_impl.h
index dc792246e1fac1d29d2f02271b5dc03735b37d90..dae9c8dc816eed3c4131a24a5b7b392920d9679b 100644
--- a/content/common/gpu/client/gpu_memory_buffer_impl.h
+++ b/content/common/gpu/client/gpu_memory_buffer_impl.h
@@ -33,9 +33,11 @@ class CONTENT_EXPORT GpuMemoryBufferImpl : public gfx::GpuMemoryBuffer {
   // Type-checking upcast routine. Returns an NULL on failure.
   static GpuMemoryBufferImpl* FromClientBuffer(ClientBuffer buffer);
 
-  // Returns the number of bytes per pixel that must be used by an
-  // implementation when using |format|.
-  static size_t BytesPerPixel(Format format);
+  // Calculates the number of bytes that an implementation must use to store
+  // one row of pixel data.
+  static bool StrideInBytes(size_t width,
+                            Format format,
+                            size_t* stride_in_bytes);
 
   // Overridden from gfx::GpuMemoryBuffer:
   bool IsMapped() const override;