extend SkBenchmark to allow a bench to return a durationScale, which allows it to perform fewer act…

bench/SkBenchmark.cpp

Index: bench/SkBenchmark.cpp
diff --git a/bench/SkBenchmark.cpp b/bench/SkBenchmark.cpp
index 6afcd8e9f39e9db09792d148f2c92c6652e6b528..43f78b0f2ddc50eb15d8ebddd617e1fdfd9b319b 100644
--- a/bench/SkBenchmark.cpp
+++ b/bench/SkBenchmark.cpp
@@ -20,6 +20,7 @@ SkBenchmark::SkBenchmark(void* defineDict) {
     fDither = SkTriState::kDefault;
     fHasStrokeWidth = false;
     fIsRendering = true;
+    fOrMask = fClearMask = 0;
 }
 
 const char* SkBenchmark::getName() {
@@ -47,6 +48,8 @@ void SkBenchmark::setupPaint(SkPaint* paint) {
     paint->setAntiAlias(fForceAA);
     paint->setFilterBitmap(fForceFilter);
 
+    paint->setFlags((paint->getFlags() & ~fClearMask) | fOrMask);
+
     if (SkTriState::kDefault != fDither) {
         paint->setDither(SkTriState::kTrue == fDither);
     }