(blink) Propagate scrolling/marginwidth/marginheight property values to child frame.

Source/core/loader/FrameFetchContextTest.cpp

 /*
  * Copyright (c) 2015, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 67 matching lines @@
     {
         return adoptPtrWillBeNoop(new StubFrameOwner);
     }
 
     DEFINE_INLINE_VIRTUAL_TRACE() { FrameOwner::trace(visitor); }
 
     bool isLocal() const override { return false; }
     SandboxFlags sandboxFlags() const override { return SandboxNone; }
     void dispatchLoad() override { }
     void renderFallbackContent() override { }
+    ScrollbarMode scrollingMode() const override { return ScrollbarAuto; }
+    int marginWidth() const override { return -1; }
+    int marginHeight() const override { return -1; }
 };
 
 class FrameFetchContextTest : public ::testing::Test {
 protected:
     void SetUp() override
     {
         dummyPageHolder = DummyPageHolder::create(IntSize(500, 500));
         dummyPageHolder->page().setDeviceScaleFactor(1.0);
         documentLoader = DocumentLoader::create(&dummyPageHolder->frame(), ResourceRequest("http://www.example.com"), SubstituteData());
         document = toHTMLDocument(&dummyPageHolder->document());
@@ skipping 399 matching lines @@
     EXPECT_EQ(ResourceLoadPriorityVeryHigh, childFetchContext->modifyPriorityForExperiments(ResourceLoadPriorityVeryHigh, Resource::MainResource, request));
     EXPECT_EQ(ResourceLoadPriorityMedium, childFetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Script, request));
 
     // Low priority iframes enabled, everything should be low priority
     settings->setLowPriorityIframes(true);
     EXPECT_EQ(ResourceLoadPriorityVeryLow, childFetchContext->modifyPriorityForExperiments(ResourceLoadPriorityVeryHigh, Resource::MainResource, request));
     EXPECT_EQ(ResourceLoadPriorityVeryLow, childFetchContext->modifyPriorityForExperiments(ResourceLoadPriorityMedium, Resource::Script, request));
 }
 
 } // namespace