Implement WEBGL_compressed_texture_s3tc_srgb

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 6feca3d1ca16ab4b7fe237edfe41ca08b8a59176..51506971680f37e51e6401568c3a5e8e2c05d447 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -12109,6 +12109,8 @@ bool GLES2DecoderImpl::GetCompressedTexSizeInBytes(
     case GL_ATC_RGB_AMD:
     case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
     case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
     case GL_ETC1_RGB8_OES:
       bytes_required =
           (width + kS3TCBlockWidth - 1) / kS3TCBlockWidth;
@@ -12163,6 +12165,8 @@ bool GLES2DecoderImpl::GetCompressedTexSizeInBytes(
     case GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD:
     case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
     case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
       bytes_required =
           (width + kS3TCBlockWidth - 1) / kS3TCBlockWidth;
       bytes_required *=
@@ -12274,6 +12278,10 @@ bool GLES2DecoderImpl::ValidateCompressedTexDimensions(
     case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
     case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
     case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
       DCHECK_EQ(1, depth);  // 2D formats.
       if (!IsValidDXTSize(level, width) || !IsValidDXTSize(level, height)) {
         LOCAL_SET_GL_ERROR(
@@ -12380,7 +12388,11 @@ bool GLES2DecoderImpl::ValidateCompressedTexSubDimensions(
     case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
     case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
     case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
-    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT: {
+    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT: {
       const int kBlockWidth = 4;
       const int kBlockHeight = 4;
       if ((xoffset % kBlockWidth) || (yoffset % kBlockHeight)) {