Make SkGpuBlurUtils::GaussianBlur more drawContext centric

src/effects/SkGpuBlurUtils.h

Index: src/effects/SkGpuBlurUtils.h
diff --git a/src/effects/SkGpuBlurUtils.h b/src/effects/SkGpuBlurUtils.h
index 8bc4377f5980af690cf3efd364450c2f7cf63b37..c3af467300196998511084bd470ce6de6860c0fb 100644
--- a/src/effects/SkGpuBlurUtils.h
+++ b/src/effects/SkGpuBlurUtils.h
@@ -9,17 +9,14 @@
 #define SkGpuBlurUtils_DEFINED
 
 #if SK_SUPPORT_GPU
-#include "GrTextureProvider.h"
+#include "GrDrawContext.h"
 
-class GrTexture;
 class GrContext;
-#endif
+class GrTexture;
 
 struct SkRect;
 
 namespace SkGpuBlurUtils {
-
-#if SK_SUPPORT_GPU
   /**
     * Applies a 2D Gaussian blur to a given texture.
     * @param context         The GPU context
@@ -33,15 +30,15 @@ namespace SkGpuBlurUtils {
     * @return the blurred texture, which may be srcTexture reffed, or a
     * new texture.  It is the caller's responsibility to unref this texture.

[bsalomon, 2016/05/11 13:07:42]

Maybe update this comment and note that callers may want further draw into the
texture with the blurred result?

[robertphillips, 2016/05/11 14:26:30]

Done.

     */
-    GrTexture* GaussianBlur(GrContext* context,
-                            GrTexture* srcTexture,
-                            bool gammaCorrect,
-                            const SkRect& dstBounds,
-                            const SkRect* srcBounds,
-                            float sigmaX,
-                            float sigmaY);
-#endif
+    sk_sp<GrDrawContext> GaussianBlur(GrContext* context,
+                                      GrTexture* srcTexture,
+                                      bool gammaCorrect,
+                                      const SkRect& dstBounds,
+                                      const SkRect* srcBounds,
+                                      float sigmaX,
+                                      float sigmaY);
 
 };
 
 #endif
+#endif