Work around for nexus 6 TexSubImage issue

src/gpu/GrCaps.cpp

Index: src/gpu/GrCaps.cpp
diff --git a/src/gpu/GrCaps.cpp b/src/gpu/GrCaps.cpp
index ba4e10430dfffa977dd1535e084bde99bc2b2f3c..f2e88b01c47d754c89e894fcf62b4580048eae16 100644
--- a/src/gpu/GrCaps.cpp
+++ b/src/gpu/GrCaps.cpp
@@ -109,6 +109,7 @@ GrCaps::GrCaps(const GrContextOptions& options) {
     fSupressPrints = options.fSuppressPrints;
     fDrawPathMasksToCompressedTextureSupport = options.fDrawPathToCompressedTexture;
     fGeometryBufferMapThreshold = options.fGeometryBufferMapThreshold;
+    fUseDrawInsteadOfPartialRenderTargetWrite = options.fUseDrawInsteadOfPartialRenderTargetWrite;
 }
 
 void GrCaps::applyOptionsOverrides(const GrContextOptions& options) {
@@ -150,6 +151,8 @@ SkString GrCaps::dump() const {
     r.appendf("Oversized Stencil Support          : %s\n", gNY[fOversizedStencilSupport]);
     r.appendf("Texture Barrier Support            : %s\n", gNY[fTextureBarrierSupport]);
     r.appendf("Draw Instead of Clear [workaround] : %s\n", gNY[fUseDrawInsteadOfClear]);
+    r.appendf("Draw Instead of TexSubImage [workaround] : %s\n",
+              gNY[fUseDrawInsteadOfPartialRenderTargetWrite]);
     if (this->advancedBlendEquationSupport()) {
         r.appendf("Advanced Blend Equation Blacklist  : 0x%x\n", fAdvBlendEqBlacklist);
     }