Add support for GL_EXT_raster_multisample

src/gpu/gl/GrGLPathRendering.cpp

Index: src/gpu/gl/GrGLPathRendering.cpp
diff --git a/src/gpu/gl/GrGLPathRendering.cpp b/src/gpu/gl/GrGLPathRendering.cpp
index 7fb85352fb5b00aa2db7283745666ba44f3ccd8f..441967edc5ab868966b2a9dce7f09da5549bfcf5 100644
--- a/src/gpu/gl/GrGLPathRendering.cpp
+++ b/src/gpu/gl/GrGLPathRendering.cpp
@@ -106,7 +106,7 @@ void GrGLPathRendering::onStencilPath(const StencilPathArgs& args, const GrPath*
     SkISize size = SkISize::Make(rt->width(), rt->height());
     this->setProjectionMatrix(*args.fViewMatrix, size, rt->origin());
     gpu->flushScissor(*args.fScissor, rt->getViewport(), rt->origin());
-    gpu->flushHWAAState(rt, args.fUseHWAA);
+    gpu->flushHWAAState(rt, args.fUseHWAA, true);
     gpu->flushRenderTarget(rt, nullptr);
 
     const GrGLPath* glPath = static_cast<const GrGLPath*>(path);