Implement the texture uploading of ASTC compression for WebGL

ui/gfx/gpu_memory_buffer.h

 // Copyright 2013 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_GPU_MEMORY_BUFFER_H_
 #define UI_GFX_GPU_MEMORY_BUFFER_H_
 
 #include "base/memory/shared_memory.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "build/build_config.h"
@@ skipping 27 matching lines @@
                                  GpuMemoryBufferId buffer_id);
 
 // This interface typically correspond to a type of shared memory that is also
 // shared with the GPU. A GPU memory buffer can be written to directly by
 // regular CPU code, but can also be read by the GPU.
 class GFX_EXPORT GpuMemoryBuffer {
  public:
   // The format needs to be taken into account when mapping a buffer into the
   // client's address space.
   enum Format {
+    ASTC,

[piman, 2015/08/17 23:00:21]

Can you name this one ASTC_4X4? For future-proofing as well as making it clearer
everywhere which block size we're talking about?

     ATC,
     ATCIA,
     DXT1,
     DXT5,
     ETC1,
     R_8,
     RGBA_4444,
     RGBA_8888,
     RGBX_8888,
     BGRA_8888,
@@ skipping 38 matching lines @@
   // Returns a platform specific handle for this buffer.
   virtual GpuMemoryBufferHandle GetHandle() const = 0;
 
   // Type-checking downcast routine.
   virtual ClientBuffer AsClientBuffer() = 0;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GPU_MEMORY_BUFFER_H_