Update CopyTexImage2D to do internal format validation in ES3

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 a555557a96e6859dde37b5d94e1558de7b50f297..72c6fa1ab02b10f8cf1871980357fa0d101786cf 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -1567,6 +1567,9 @@ class GLES2DecoderImpl : public GLES2Decoder,
   // attached. Generates GL error if not.
   bool CheckBoundReadFramebufferColorAttachment(const char* func_name);
 
+  // Infer color encoding from internalformat
+  static GLint GetColorEncodingFromInternalFormat(GLenum internalformat);
+
   // Check that the currently bound read framebuffer's color image
   // isn't the target texture of the glCopyTex{Sub}Image2D.
   bool FormsTextureCopyingFeedbackLoop(TextureRef* texture, GLint level);
@@ -4019,6 +4022,19 @@ bool GLES2DecoderImpl::CheckBoundReadFramebufferColorAttachment(
   return true;
 }
 
+GLint GLES2DecoderImpl::GetColorEncodingFromInternalFormat(
+    GLenum 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;
+  }
+}
+
 bool GLES2DecoderImpl::FormsTextureCopyingFeedbackLoop(
     TextureRef* texture, GLint level) {
   Framebuffer* framebuffer = features().chromium_framebuffer_multisample ?
@@ -11003,6 +11019,20 @@ void GLES2DecoderImpl::DoCopyTexImage2D(
     return;
   }
 
+  if (feature_info_->IsES3Enabled()) {
+    GLint color_encoding = GetColorEncodingFromInternalFormat(read_format);
+    if (color_encoding != GetColorEncodingFromInternalFormat(internal_format) ||
+        GLES2Util::IsFloatFormat(internal_format) ||
+        (GLES2Util::IsSignedIntegerFormat(internal_format) !=
+         GLES2Util::IsSignedIntegerFormat(read_format)) ||
+        (GLES2Util::IsUnsignedIntegerFormat(internal_format) !=
+         GLES2Util::IsUnsignedIntegerFormat(read_format))) {
+      LOCAL_SET_GL_ERROR(
+          GL_INVALID_OPERATION, "glCopyTexImage2D", "incompatible format");
+      return;
+    }
+  }
+
   if ((channels_needed & (GLES2Util::kDepth | GLES2Util::kStencil)) != 0) {
     LOCAL_SET_GL_ERROR(
         GL_INVALID_OPERATION,