Reland of Select correct copy method for DoCopySubTexture

gpu/command_buffer/common/gles2_cmd_utils.cc

Index: gpu/command_buffer/common/gles2_cmd_utils.cc
diff --git a/gpu/command_buffer/common/gles2_cmd_utils.cc b/gpu/command_buffer/common/gles2_cmd_utils.cc
index 7d97aeb6c505b25dbf8e8dabd96b828852296661..6eb9b8e0827283f571e4fe4879ce80b9f9a90feb 100644
--- a/gpu/command_buffer/common/gles2_cmd_utils.cc
+++ b/gpu/command_buffer/common/gles2_cmd_utils.cc
@@ -1309,6 +1309,18 @@ bool GLES2Util::IsSizedColorFormat(uint32_t internal_format) {
   }
 }
 
+GLint GLES2Util::GetColorEncodingFromInternalFormat(uint32_t internalformat) {
+  switch (internalformat) {
+    case GL_SRGB_EXT:
+    case GL_SRGB_ALPHA_EXT:
+    case GL_SRGB8:
+    case GL_SRGB8_ALPHA8:
+      return GL_SRGB;
+    default:
+      return GL_LINEAR;
+  }
+}
+
 void GLES2Util::GetColorFormatComponentSizes(
     uint32_t internal_format, uint32_t type, int* r, int* g, int* b, int* a) {
   DCHECK(r && g && b && a);