Adds DevTools commands for forced viewport override.

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/compositing/CompositedLayerMapping.h"
 
 #include "core/frame/FrameView.h"
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/api/LayoutViewItem.h"
@@ skipping 90 matching lines @@
 {
     setBodyInnerHTML("<div id='target' style='width: 200px; height: 10000px; will-change: transform'></div>");
 
     document().settings()->setMainFrameClipsContent(false);
 
     document().view()->updateAllLifecyclePhases();
     Element* element = document().getElementById("target");
     PaintLayer* paintLayer = toLayoutBoxModelObject(element->layoutObject())->layer();
     ASSERT_TRUE(paintLayer->graphicsLayerBacking());
     ASSERT_TRUE(paintLayer->compositedLayerMapping());
-    // recomputeInterestRect computes the interest rect; computeInterestRect applies the extra setting to paint everything.
-    EXPECT_RECT_EQ(IntRect(0, 0, 200, 4592), recomputeInterestRect(paintLayer->graphicsLayerBacking()));
+    // Clipping is disabled in recomputeInterestRect.
+    EXPECT_RECT_EQ(IntRect(0, 0, 200, 10000), recomputeInterestRect(paintLayer->graphicsLayerBacking()));
     EXPECT_RECT_EQ(IntRect(0, 0, 200, 10000), computeInterestRect(paintLayer->compositedLayerMapping(), paintLayer->graphicsLayerBacking(), IntRect()));
 }
 
 TEST_F(CompositedLayerMappingTest, VerticalRightLeftWritingModeDocument)
 {
     setBodyInnerHTML("<style>html,body { margin: 0px } html { -webkit-writing-mode: vertical-rl}</style> <div id='target' style='width: 10000px; height: 200px;'></div>");
 
-    document().settings()->setMainFrameClipsContent(false);
-
     document().view()->updateAllLifecyclePhases();
     document().view()->setScrollPosition(DoublePoint(-5000, 0), ProgrammaticScroll);
     document().view()->updateAllLifecyclePhases();
 
     PaintLayer* paintLayer = document().layoutViewItem().layer();
     ASSERT_TRUE(paintLayer->graphicsLayerBacking());
     ASSERT_TRUE(paintLayer->compositedLayerMapping());
     // A scroll by -5000px is equivalent to a scroll by (10000 - 5000 - 800)px = 4200px in non-RTL mode. Expanding
     // the resulting rect by 4000px in each direction yields this result.
     EXPECT_RECT_EQ(IntRect(200, 0, 8800, 600), recomputeInterestRect(paintLayer->graphicsLayerBacking()));
@@ skipping 521 matching lines @@
     EXPECT_FALSE(shouldPaintBackgroundOntoScrollingContentsLayer("scroller1"));
 
     // Second scroller cannot paint background into scrolling contents layer because it has a content-box clip without local attachment.
     EXPECT_FALSE(shouldPaintBackgroundOntoScrollingContentsLayer("scroller2"));
 
     // Third scroller can paint background into scrolling contents layer.
     EXPECT_TRUE(shouldPaintBackgroundOntoScrollingContentsLayer("scroller3"));
 }
 
 } // namespace blink