disable conservative rasterclip on gpu, until we understand perspective

BUG=skia:
R=bsalomon@google.com

Author: reed@google.com

Review URL: https://codereview.chromium.org/561763002
diff --git a/include/gpu/SkGpuDevice.h b/include/gpu/SkGpuDevice.h
index 5545227..419013f 100644
--- a/include/gpu/SkGpuDevice.h
+++ b/include/gpu/SkGpuDevice.h
@@ -152,7 +152,9 @@
     virtual SkSurface* newSurface(const SkImageInfo&) SK_OVERRIDE;
 
     virtual SkImageFilter::Cache* getImageFilterCache() SK_OVERRIDE;
-    virtual bool forceConservativeRasterClip() const SK_OVERRIDE { return true; }
+
+    // temporarily change the return to false, until we understand the issues with filters and persp
+    virtual bool forceConservativeRasterClip() const SK_OVERRIDE { return false; }
 
     // sets the render target, clip, and matrix on GrContext. Use forceIdenity to override
     // SkDraw's matrix and draw in device coords.