Add half-float IOSurface GpuMemoryBuffer support

components/exo/buffer.cc

 // 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.
 
 #include "components/exo/buffer.h"
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 #include <stdint.h>
@@ skipping 35 matching lines @@
       GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,    // DXT5
       GL_ETC1_RGB8_OES,                    // ETC1
       GL_R8_EXT,                           // R_8
       GL_RG8_EXT,                          // RG_88
       GL_RGB,                              // BGR_565
       GL_RGBA,                             // RGBA_4444
       GL_RGB,                              // RGBX_8888
       GL_RGBA,                             // RGBA_8888
       GL_RGB,                              // BGRX_8888
       GL_BGRA_EXT,                         // BGRA_8888
+      GL_RGBA,                             // RGBA_F16
       GL_RGB_YCRCB_420_CHROMIUM,           // YVU_420
       GL_RGB_YCBCR_420V_CHROMIUM,          // YUV_420_BIPLANAR
       GL_RGB_YCBCR_422_CHROMIUM,           // UYVY_422
   };
   static_assert(arraysize(kGLInternalFormats) ==
                     (static_cast<int>(gfx::BufferFormat::LAST) + 1),
                 "BufferFormat::LAST must be last value of kGLInternalFormats");
 
   DCHECK(format <= gfx::BufferFormat::LAST);
   return kGLInternalFormats[static_cast<int>(format)];
@@ skipping 492 matching lines @@
 
   // Cancel callback to indicate that buffer has been released.
   release_contents_callback_.Cancel();
 
   // Release buffer if not attached to surface.
   if (!attach_count_)
     Release();
 }
 
 }  // namespace exo