gpu: support R16 GPUMemoryBuffer

ui/gl/test/gl_image_test_support.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 "ui/gl/test/gl_image_test_support.h"
 
 #include <vector>
 
 #include "ui/gfx/half_float.h"
 #include "ui/gl/gl_implementation.h"
@@ skipping 36 matching lines @@
 // static
 void GLImageTestSupport::SetBufferDataToColor(int width,
                                               int height,
                                               int stride,
                                               int plane,
                                               gfx::BufferFormat format,
                                               const uint8_t color[4],
                                               uint8_t* data) {
   switch (format) {
     case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::R_16:

[aleksandar.stojiljkovic, 2017/06/08 14:27:56]

are there any tests using this?

Should be something like:
uint16_t red = (uint16_t)color[0] << 8; 
for (int y = 0; y < height; ++y) {
  uint16_t* row = reinterpret_cast<uint16_t*>(data + y * stride);
  for (int x = 0; x < width; ++x) {
    row[x] = red;
  }
}

[riju_, 2017/06/09 08:20:10]

Thanks.

[riju_, 2017/06/09 08:20:10]

Done.

     case gfx::BufferFormat::RG_88:
       DCHECK_EQ(0, plane);
       for (int y = 0; y < height; ++y) {
         memset(&data[y * stride], color[0], width);
       }
       return;
     case gfx::BufferFormat::BGR_565:
       DCHECK_EQ(0, plane);
       for (int y = 0; y < height; ++y) {
         for (int x = 0; x < width; ++x) {
@@ skipping 126 matching lines @@
     case gfx::BufferFormat::ETC1:
     case gfx::BufferFormat::RGBA_4444:
     case gfx::BufferFormat::UYVY_422:
       NOTREACHED();
       return;
   }
   NOTREACHED();
 }
 
 }  // namespace gl