Fix PinchViewport::visibleRectInDocument

Source/web/tests/PinchViewportTest.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 "config.h"
 
 #include "core/frame/PinchViewport.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/FrameHost.h"
@@ skipping 444 matching lines @@
     expectedRect.scale(1 / 3.0f);
     expectedRect.setLocation(oldLocation);
     pinchViewport.setScale(3);
     EXPECT_FLOAT_RECT_EQ(expectedRect, pinchViewport.visibleRect());
 
     expectedRect.setLocation(FloatPoint(0.25f, 0.333f));
     pinchViewport.setLocation(expectedRect.location());
     EXPECT_FLOAT_RECT_EQ(expectedRect, pinchViewport.visibleRect());
 }
 
+// Make sure that the visibleRectInDocument method acurately reflects the scale
+// and scroll location of the viewport relative to the document.
+TEST_F(PinchViewportTest, TestVisibleRectInDocument)
+{
+    initializeWithDesktopSettings();
+    webViewImpl()->resize(IntSize(100, 400));
+
+    registerMockedHttpURLLoad("200-by-800-viewport.html");
+    navigateTo(m_baseURL + "200-by-800-viewport.html");
+
+    PinchViewport& pinchViewport = frame()->page()->frameHost().pinchViewport();
+
+    // Scale the viewport to 2X and move it.
+    pinchViewport.setScale(2);
+    pinchViewport.setLocation(FloatPoint(10, 15));
+    EXPECT_FLOAT_RECT_EQ(FloatRect(10, 15, 50, 200), pinchViewport.visibleRectInDocument());
+
+    // Scroll the layout viewport. Ensure its offset is reflected in visibleRectInDocument().
+    FrameView& frameView = *webViewImpl()->mainFrameImpl()->frameView();
+    frameView.setScrollPosition(DoublePoint(40, 100), ProgrammaticScroll);
+    EXPECT_FLOAT_RECT_EQ(FloatRect(50, 115, 50, 200), pinchViewport.visibleRectInDocument());
+}
+
 TEST_F(PinchViewportTest, TestFractionalScrollOffsetIsNotOverwritten)
 {
     initializeWithAndroidSettings();
     webViewImpl()->resize(IntSize(200, 250));
 
     registerMockedHttpURLLoad("200-by-800-viewport.html");
     navigateTo(m_baseURL + "200-by-800-viewport.html");
 
     FrameView& frameView = *webViewImpl()->mainFrameImpl()->frameView();
     frameView.scrollTo(DoublePoint(0, 10.5));
@@ skipping 1183 matching lines @@
     registerMockedHttpURLLoad("window_dimensions_wide_div.html");
     webViewImpl()->resize(IntSize(800, 600));
     navigateTo(m_baseURL + "window_dimensions_wide_div.html");
 
     Element* output = frame()->document()->getElementById("output");
     ASSERT(output);
     EXPECT_EQ(std::string("2000x1500"), std::string(output->innerHTML().ascii().data()));
 }
 
 } // namespace