Add flag to stage filtering behavior change

See https://skia-review.googlesource.com/c/skia/+/335593

Bug: skia:7650
Change-Id: Ie8237e3fb62ba95a0b1ccfd582dc04ce45885aac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2544804Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Cr-Commit-Position: refs/heads/master@{#828304}

skia/config/SkUserConfig.h

@@ -229,6 +229,10 @@ SK_API void SkDebugf_FileLine(const char* file,
 #define GR_OP_ALLOCATE_USE_NEW
 #endif
 
+#ifndef SK_SUPPORT_LEGACY_ADJUSTHQHEURISTIC
+#define SK_SUPPORT_LEGACY_ADJUSTHQHEURISTIC
+#endif
+
 // Staging for lowp::bilerp_clamp_8888, and for planned misc. others.
 #define SK_DISABLE_LOWP_BILERP_CLAMP_CLAMP_STAGE