Experimentally removing MSAA workaround for perf bot

The perf bot perf.chromium-rel-mac12 has alerted on a ~50% slowdown in
http___webglsamples.org_dynamic-cubemap_dynamic-cubemap.html .
In the regression range was my seemingly closely
related CL: https://crrev.com/c/923103
But that commit should improve performance, not regress it.

So this CL adds an exception to the workaround in 923103, so that
that workaround does not apply on perf.chromium-rel-mac12.
This should help determine whether my CL really caused a regression.

I'm expecting this CL to cause a regression in
http___kenrussell.github.io_webgl-animometer_Animometer_tests_3d_webgl.html
(undoing the recent improvement caused by 923103).

Bug: 815154
Change-Id: I335133a127bb7cfcb92ba29065641dfd55b63166
Reviewed-on: https://chromium-review.googlesource.com/938844
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540237}

content/test/gpu/gpu_tests/pixel_expectations.py

@@ -139,3 +139,33 @@ def SetExpectations(self):
 
     self.Fail('Pixel_CSSFilterEffects', ['mac'], bug=815045)
     self.Fail('Pixel_CSSFilterEffects_NoOverlays', ['mac'], bug=815045)
+
+    # TODO(kainino): temporary suppressions for perf experiment
+    self.Fail('Pixel_2DCanvasWebGL',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_IOSurface2DCanvasWebGL',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_OffscreenCanvasTransferAfterStyleResize',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_OffscreenCanvasTransferBeforeStyleResize',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_OffscreenCanvasWebGLDefault',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_OffscreenCanvasWebGLDefaultWorker',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_OffscreenCanvasWebGLSoftwareCompositing',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_OffscreenCanvasWebGLSoftwareCompositingWorker',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_OffscreenCanvasWebglResizeOnWorker',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_WebGLGreenTriangle_AA_Alpha',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_WebGLGreenTriangle_AA_Alpha_SwiftShader',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_WebGLGreenTriangle_AA_NoAlpha',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_WebGLGreenTriangle_NonChromiumImage_AA_Alpha',
+        ['mac', 'intel'], bug=815154)
+    self.Fail('Pixel_WebGLGreenTriangle_NonChromiumImage_AA_NoAlpha',
+        ['mac', 'intel'], bug=815154)

gpu/config/gpu_driver_bug_list.json

@@ -2777,6 +2777,13 @@
       "os": {
         "type": "macosx"
       },
+      "exceptions" : [
+        {
+          "comment": "TODO(kainino): testing whether this CL is really responsible for crbug.com/815154",
+          "vendor_id": "0x8086",
+          "device_id": ["0x0a2e"]
+        }
+      ],
       "vendor_id": "0x8086",
       "multi_gpu_category": "primary",
       "features": [