gpu: support RG_88 GpuMemoryBuffer

gpu/command_buffer/common/gpu_memory_buffer_support.cc

Index: gpu/command_buffer/common/gpu_memory_buffer_support.cc
diff --git a/gpu/command_buffer/common/gpu_memory_buffer_support.cc b/gpu/command_buffer/common/gpu_memory_buffer_support.cc
index a9480a0dbbdaea620f6a30056c5b08593bad52fc..68237a08fd255e6ffc020f530493d662ffad0290 100644
--- a/gpu/command_buffer/common/gpu_memory_buffer_support.cc
+++ b/gpu/command_buffer/common/gpu_memory_buffer_support.cc
@@ -18,6 +18,8 @@ gfx::BufferFormat BufferFormatForInternalFormat(unsigned internalformat) {
   switch (internalformat) {
     case GL_RED_EXT:
       return gfx::BufferFormat::R_8;
+    case GL_RG_EXT:
+      return gfx::BufferFormat::RG_88;
     case GL_RGB:
       return gfx::BufferFormat::BGRX_8888;
     case GL_RGBA:
@@ -72,6 +74,7 @@ bool IsImageFormatCompatibleWithGpuMemoryBufferFormat(
     case gfx::BufferFormat::DXT5:
     case gfx::BufferFormat::ETC1:
     case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::RG_88:
     case gfx::BufferFormat::RGBA_8888:
     case gfx::BufferFormat::YVU_420:
     case gfx::BufferFormat::YUV_420_BIPLANAR:
@@ -104,6 +107,7 @@ bool IsGpuMemoryBufferFormatSupported(gfx::BufferFormat format,
     case gfx::BufferFormat::ETC1:
       return capabilities.texture_format_etc1;
     case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::RG_88:
       return capabilities.texture_rg;
     case gfx::BufferFormat::UYVY_422:
       return capabilities.image_ycbcr_422;
@@ -139,6 +143,7 @@ bool IsImageSizeValidForGpuMemoryBufferFormat(const gfx::Size& size,
       // by the block size.
       return size.width() % 4 == 0 && size.height() % 4 == 0;
     case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::RG_88:
     case gfx::BufferFormat::BGR_565:
     case gfx::BufferFormat::RGBA_4444:
     case gfx::BufferFormat::RGBA_8888: