Add ANGLE workaround to prefer flushes over VRAM usage

src/gpu/GrCaps.cpp

Index: src/gpu/GrCaps.cpp
diff --git a/src/gpu/GrCaps.cpp b/src/gpu/GrCaps.cpp
index b7e43d6a114eb873df201c0a8bbf16f39cd10db2..e40057686c52323b76ba36a759ff4539c78370a5 100644
--- a/src/gpu/GrCaps.cpp
+++ b/src/gpu/GrCaps.cpp
@@ -114,6 +114,8 @@ GrCaps::GrCaps(const GrContextOptions& options) {
     fDrawPathMasksToCompressedTextureSupport = options.fDrawPathToCompressedTexture;
     fGeometryBufferMapThreshold = options.fGeometryBufferMapThreshold;
     fUseDrawInsteadOfPartialRenderTargetWrite = options.fUseDrawInsteadOfPartialRenderTargetWrite;
+
+    fPreferVRAMUseOverFlushes = true;

[bsalomon, 2015/08/21 15:41:31]

Hmm... our other workarounds are worded the other way where false means don't
apply the workaround. Otherwise lgtm.

[robertphillips, 2015/08/21 15:47:15]

I did it that way at first and found it a bit confusing.

 }
 
 void GrCaps::applyOptionsOverrides(const GrContextOptions& options) {
@@ -161,6 +163,8 @@ SkString GrCaps::dump() const {
     r.appendf("Draw Instead of Clear [workaround] : %s\n", gNY[fUseDrawInsteadOfClear]);
     r.appendf("Draw Instead of TexSubImage [workaround] : %s\n",
               gNY[fUseDrawInsteadOfPartialRenderTargetWrite]);
+    r.appendf("Prefer VRAM Use over flushes [workaround] : %s\n", gNY[fPreferVRAMUseOverFlushes]);
+
     if (this->advancedBlendEquationSupport()) {
         r.appendf("Advanced Blend Equation Blacklist  : 0x%x\n", fAdvBlendEqBlacklist);
     }