Add SkColorSpace to GrDrawContext

src/effects/SkGpuBlurUtils.h

Index: src/effects/SkGpuBlurUtils.h
diff --git a/src/effects/SkGpuBlurUtils.h b/src/effects/SkGpuBlurUtils.h
index 4f80fc31143465a246c19f8dda5406bc80befe49..550f3b8d6f9a6185f41ea5cae0172239351c8006 100644
--- a/src/effects/SkGpuBlurUtils.h
+++ b/src/effects/SkGpuBlurUtils.h
@@ -23,6 +23,7 @@ namespace SkGpuBlurUtils {
     * Note: one of sigmaX and sigmaY should be non-zero!
     * @param context         The GPU context
     * @param srcTexture      The source texture to be blurred.
+    * @param colorSpace      Color space of the source (used for the drawContext result, too).
     * @param gammaCorrect    Should blur be gamma-correct (sRGB to linear, etc...)
     * @param dstBounds       The destination bounds, relative to the source texture.
     * @param srcBounds       The source bounds, relative to the source texture. If non-null,
@@ -33,6 +34,7 @@ namespace SkGpuBlurUtils {
     */
     sk_sp<GrDrawContext> GaussianBlur(GrContext* context,
                                       GrTexture* srcTexture,
+                                      sk_sp<SkColorSpace> colorSpace,
                                       bool gammaCorrect,
                                       const SkIRect& dstBounds,
                                       const SkIRect* srcBounds,