added support for PLS path rendering

include/gpu/GrCaps.h

Index: include/gpu/GrCaps.h
diff --git a/include/gpu/GrCaps.h b/include/gpu/GrCaps.h
index 679777f9ddc74caab3c3820d4258e371a0eeb003..5fbd869c019bbd489eeb6a49395fcea5053f48ad 100644
--- a/include/gpu/GrCaps.h
+++ b/include/gpu/GrCaps.h
@@ -81,6 +81,8 @@ public:
     */
     bool floatPrecisionVaries() const { return fShaderPrecisionVaries; }
 
+    int pixelLocalStorageSize() const { return fPixelLocalStorageSize; }

[bsalomon, 2016/01/13 19:15:33]

Maybe a comment that if > 0 then PLS is supported and the returned value
indicates the number of bytes of storage available?

+
 protected:
     /** Subclasses must call this after initialization in order to apply caps overrides requested by
         the client. Note that overrides will only reduce the caps never expand them. */
@@ -94,6 +96,7 @@ protected:
 
     bool fShaderPrecisionVaries;
     PrecisionInfo fFloatPrecisions[kGrShaderTypeCount][kGrSLPrecisionCount];
+    int fPixelLocalStorageSize;
 
 private:
     virtual void onApplyOptionsOverrides(const GrContextOptions&) {};