gpu: support RG_88 GpuMemoryBuffer

ui/gl/gl_image_memory.cc

Index: ui/gl/gl_image_memory.cc
diff --git a/ui/gl/gl_image_memory.cc b/ui/gl/gl_image_memory.cc
index 5b43f33cc98709203e83234942d85f5bda806fc7..0c38c9b836d961cf10486f3d015571094a9c8e5b 100644
--- a/ui/gl/gl_image_memory.cc
+++ b/ui/gl/gl_image_memory.cc
@@ -27,6 +27,7 @@ bool ValidInternalFormat(unsigned internalformat) {
     case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
     case GL_ETC1_RGB8_OES:
     case GL_RED:
+    case GL_RG:
     case GL_RGB:
     case GL_RGBA:
     case GL_BGRA_EXT:
@@ -44,6 +45,7 @@ bool ValidFormat(gfx::BufferFormat format) {
     case gfx::BufferFormat::DXT5:
     case gfx::BufferFormat::ETC1:
     case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::RG_88:
     case gfx::BufferFormat::BGR_565:
     case gfx::BufferFormat::RGBA_4444:
     case gfx::BufferFormat::RGBX_8888:
@@ -70,6 +72,7 @@ bool IsCompressedFormat(gfx::BufferFormat format) {
     case gfx::BufferFormat::ETC1:
       return true;
     case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::RG_88:
     case gfx::BufferFormat::BGR_565:
     case gfx::BufferFormat::RGBA_4444:
     case gfx::BufferFormat::RGBX_8888:
@@ -102,6 +105,8 @@ GLenum TextureFormat(gfx::BufferFormat format) {
       return GL_ETC1_RGB8_OES;
     case gfx::BufferFormat::R_8:
       return GL_RED;
+    case gfx::BufferFormat::RG_88:
+      return GL_RG;
     case gfx::BufferFormat::RGBA_4444:
     case gfx::BufferFormat::RGBA_8888:
       return GL_RGBA;
@@ -133,6 +138,7 @@ GLenum DataFormat(gfx::BufferFormat format) {
     case gfx::BufferFormat::RGBA_8888:
     case gfx::BufferFormat::BGRA_8888:
     case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::RG_88:
     case gfx::BufferFormat::ATC:
     case gfx::BufferFormat::ATCIA:
     case gfx::BufferFormat::DXT1:
@@ -161,6 +167,7 @@ GLenum DataType(gfx::BufferFormat format) {
     case gfx::BufferFormat::BGRX_8888:
     case gfx::BufferFormat::BGRA_8888:
     case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::RG_88:
       return GL_UNSIGNED_BYTE;
     case gfx::BufferFormat::ATC:
     case gfx::BufferFormat::ATCIA:
@@ -180,6 +187,7 @@ GLenum DataType(gfx::BufferFormat format) {
 
 GLint DataRowLength(size_t stride, gfx::BufferFormat format) {
   switch (format) {
+    case gfx::BufferFormat::RG_88:
     case gfx::BufferFormat::BGR_565:
     case gfx::BufferFormat::RGBA_4444:
       return base::checked_cast<GLint>(stride) / 2;
@@ -301,7 +309,8 @@ std::unique_ptr<uint8_t[]> GLES2Data(const gfx::Size& size,
     case gfx::BufferFormat::RGBA_4444:
     case gfx::BufferFormat::RGBA_8888:
     case gfx::BufferFormat::BGRA_8888:
-    case gfx::BufferFormat::R_8: {
+    case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::RG_88: {
       size_t gles2_data_stride =
           RowSizeForBufferFormat(size.width(), format, 0);
       if (stride == gles2_data_stride ||