gpu, cmaa: add glApplyScreenSpaceAntialiasingCHROMIUM unittests

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 62724d4adf612f220249efa6eea1f3b722e1c8cb..8ede3764a829fa3f6e6ddf362df5bc24d5786786 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -16628,6 +16628,22 @@ void GLES2DecoderImpl::DoCreateAndConsumeTextureINTERNAL(
 }
 
 void GLES2DecoderImpl::DoApplyScreenSpaceAntialiasingCHROMIUM() {
+  if (!feature_info_->feature_flags().chromium_screen_space_antialiasing) {
+    LOCAL_SET_GL_ERROR(GL_INVALID_OPERATION,
+                       "glApplyScreenSpaceAntialiasingCHROMIUM",
+                       "command not supported");
+    return;
+  }
+
+  Framebuffer* bound_framebuffer =
+      GetFramebufferInfoForTarget(GL_DRAW_FRAMEBUFFER);
+  if (!bound_framebuffer) {
+    LOCAL_SET_GL_ERROR(GL_INVALID_OPERATION,
+                       "glApplyScreenSpaceAntialiasingCHROMIUM",
+                       "no bound framebuffer object");
+    return;
+  }
+
   // Apply CMAA(Conservative Morphological Anti-Aliasing) algorithm to the
   // color attachments of currently bound draw framebuffer.
   // Reference GL_INTEL_framebuffer_CMAA for details.
@@ -16650,8 +16666,7 @@ void GLES2DecoderImpl::DoApplyScreenSpaceAntialiasingCHROMIUM() {
         return;
     }
     apply_framebuffer_attachment_cmaa_intel_
-        ->ApplyFramebufferAttachmentCMAAINTEL(
-            this, GetFramebufferInfoForTarget(GL_DRAW_FRAMEBUFFER));
+        ->ApplyFramebufferAttachmentCMAAINTEL(this, bound_framebuffer);
   }
 }