Disable fix in Skia for crbug.com/1156804.

Will remove this guard and rebaseline affected web tests once Skia fix
rolls into Chrome.

Bug: 1156804
Change-Id: I03bd00d5241a17231260061c9b72072fd565fbb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2585837
Auto-Submit: Brian Salomon <bsalomon@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836162}

skia/config/SkUserConfig.h

@@ -214,6 +214,11 @@ SK_API void SkDebugf_FileLine(const char* file,
 #define SK_DISABLE_REDUCE_OPLIST_SPLITTING
 #endif
 
+// Enabling the fix for crbug.com/1156804 will require web test rebaselining.
+#ifndef SK_IGNORE_GPU_CLAMP_BLUR_FIX
+#define SK_IGNORE_GPU_CLAMP_BLUR_FIX
+#endif
+
 // Max. verb count for paths rendered by the edge-AA tessellating path renderer.
 #define GR_AA_TESSELLATOR_MAX_VERB_COUNT 100