Reland: GpuMemoryBuffer interface change: Map(**) to Map() and memory(plane); stride(plane)

ui/gfx/buffer_format_util.h

 // Copyright 2015 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.
 
 #ifndef UI_GFX_BUFFER_FORMAT_UTIL_H_
 #define UI_GFX_BUFFER_FORMAT_UTIL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "ui/gfx/buffer_types.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/gfx_export.h"
 
 namespace gfx {
 
 // Returns a vector containing all buffer formats.
-GFX_EXPORT std::vector<BufferFormat> GetBufferFormats();
+GFX_EXPORT std::vector<BufferFormat> GetBufferFormatsForTesting();
 
 // Returns the number of planes for |format|.
 GFX_EXPORT size_t NumberOfPlanesForBufferFormat(BufferFormat format);
 
 // Returns the subsampling factor applied to the given zero-indexed |plane| of
 // |format| both horizontally and vertically.
-GFX_EXPORT size_t SubsamplingFactorForBufferFormat(
-    BufferFormat format, int plane);
+GFX_EXPORT size_t SubsamplingFactorForBufferFormat(BufferFormat format,
+                                                   int plane);
 
 // Returns the number of bytes used to store a row of the given zero-indexed
 // |plane| of |format|.
 GFX_EXPORT size_t RowSizeForBufferFormat(size_t width,
                                          BufferFormat format,
                                          int plane);
-GFX_EXPORT bool RowSizeForBufferFormatChecked(size_t width,
-                                              BufferFormat format,
-                                              int plane,
-                                              size_t* size_in_bytes)
-    WARN_UNUSED_RESULT;
 
 // Returns the number of bytes used to store all the planes of a given |format|.
 GFX_EXPORT size_t BufferSizeForBufferFormat(const Size& size,
                                             BufferFormat format);
 GFX_EXPORT bool BufferSizeForBufferFormatChecked(const Size& size,
                                                  BufferFormat format,
                                                  size_t* size_in_bytes)
     WARN_UNUSED_RESULT;
 
+GFX_EXPORT int BufferOffsetForBufferFormat(const Size& size,
+                                           BufferFormat format,
+                                           size_t plane);
+
 }  // namespace gfx
 
 #endif  // UI_GFX_BUFFER_FORMAT_UTIL_H_