Defer more renderTargetContexts in the GPU image filter paths - take 2

src/effects/SkBlurMaskFilter.cpp

Index: src/effects/SkBlurMaskFilter.cpp
diff --git a/src/effects/SkBlurMaskFilter.cpp b/src/effects/SkBlurMaskFilter.cpp
index e5d521a3581c3b7dacfe8d8d5528c453cd44c2bf..c4a6b2979849bfc0376fc86ef93094e90ebbfbb8 100644
--- a/src/effects/SkBlurMaskFilter.cpp
+++ b/src/effects/SkBlurMaskFilter.cpp
@@ -1122,7 +1122,7 @@ static sk_sp<GrTexture> find_or_create_rrect_blur_mask(GrContext* context,
     sk_sp<GrTexture> mask(context->textureProvider()->findAndRefTextureByUniqueKey(key));
     if (!mask) {
         // TODO: this could be approx but the texture coords will need to be updated
-        sk_sp<GrRenderTargetContext> rtc(context->makeRenderTargetContextWithFallback(
+        sk_sp<GrRenderTargetContext> rtc(context->makeDeferredRenderTargetContextWithFallback(
             SkBackingFit::kExact, size.fWidth, size.fHeight, kAlpha_8_GrPixelConfig, nullptr));
         if (!rtc) {
             return nullptr;
@@ -1142,8 +1142,8 @@ static sk_sp<GrTexture> find_or_create_rrect_blur_mask(GrContext* context,
                                                                        srcTexture.get(),
                                                                        nullptr,
                                                                        SkIRect::MakeWH(
-                                                                           size.fWidth,
-                                                                           size.fHeight),
+                                                                                    size.fWidth,
+                                                                                    size.fHeight),
                                                                        nullptr,
                                                                        xformedSigma, xformedSigma,
                                                                        SkBackingFit::kExact));
@@ -1152,7 +1152,9 @@ static sk_sp<GrTexture> find_or_create_rrect_blur_mask(GrContext* context,
         }
 
         mask = rtc2->asTexture();
-        SkASSERT(mask);
+        if (!mask) {
+            return nullptr;
+        }
         context->textureProvider()->assignUniqueKeyToTexture(key, mask.get());
     }
 
@@ -1540,7 +1542,7 @@ bool SkBlurMaskFilterImpl::filterMaskGPU(GrTexture* src,
     }
 
     *result = renderTargetContext->asTexture().release();
-    return true;
+    return SkToBool(*result);
 }
 
 #endif // SK_SUPPORT_GPU