Add UMA stats for pinch-zoom behavior on Android

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 781 matching lines @@
         if (detectContentOnTouch(targetedEvent)) {
             eventSwallowed = true;
             break;
         }
 
         // Don't trigger a disambiguation popup on sites designed for mobile devices.
         // Instead, assume that the page has been designed with big enough buttons and links.
         // Don't trigger a disambiguation popup when screencasting, since it's implemented outside of
         // compositor pipeline and is not being screencasted itself. This leads to bad user experience.
         WebDevToolsAgentImpl* devTools = mainFrameDevToolsAgentImpl();
+        VisualViewport& visualViewport = page()->frameHost().visualViewport();
         bool screencastEnabled = devTools && devTools->screencastEnabled();
-        if (event.data.tap.width > 0 && !shouldDisableDesktopWorkarounds() && !screencastEnabled) {
-            IntRect boundingBox(page()->frameHost().visualViewport().viewportToRootFrame(IntRect(
+        if (event.data.tap.width > 0 && !visualViewport.shouldDisableDesktopWorkarounds() && !screencastEnabled) {
+            IntRect boundingBox(visualViewport.viewportToRootFrame(IntRect(
                 event.x - event.data.tap.width / 2,
                 event.y - event.data.tap.height / 2,
                 event.data.tap.width,
                 event.data.tap.height)));
 
-            // FIXME: We shouldn't pass details of the VisualViewport offset to render_view_impl.
-            WebSize visualViewportOffset = flooredIntSize(page()->frameHost().visualViewport().location());
+            // TODO(bokan): We shouldn't pass details of the VisualViewport offset to render_view_impl.
+            //              crbug.com/459591
+            WebSize visualViewportOffset = flooredIntSize(visualViewport.location());
 
             if (m_webSettings->multiTargetTapNotificationEnabled()) {
                 Vector<IntRect> goodTargets;
                 WillBeHeapVector<RawPtrWillBeMember<Node>> highlightNodes;
                 findGoodTouchTargets(boundingBox, mainFrameImpl()->frame(), goodTargets, highlightNodes);
                 // FIXME: replace touch adjustment code when numberOfGoodTargets == 1?
                 // Single candidate case is currently handled by: https://bugs.webkit.org/show_bug.cgi?id=85101
                 if (goodTargets.size() >= 2 && m_client
                     && m_client->didTapMultipleTargets(visualViewportOffset, boundingBox, goodTargets)) {
 
@@ skipping 1243 matching lines @@
     // on the page. There is a single input event, GestureTap, which can both
     // be the first event after page load, and cause a form submission. In that
     // case, the form submission happens before the autofill client is told
     // to unblock the password values, and so the password values are not
     // submitted. To avoid that, GestureTap is handled explicitly:
     if (inputEvent.type == WebInputEvent::GestureTap && autofillClient) {
         m_userGestureObserved = true;
         autofillClient->firstUserGestureObserved();
     }
 
+    page()->frameHost().visualViewport().startTrackingPinchStats();
+
     TRACE_EVENT1("input", "WebViewImpl::handleInputEvent", "type", inputTypeToName(inputEvent.type).ascii());
     // If we've started a drag and drop operation, ignore input events until
     // we're done.
     if (m_doingDragAndDrop)
         return true;
 
     if (m_devToolsEmulator->handleInputEvent(inputEvent))
         return true;
 
     if (InspectorOverlay* overlay = inspectorOverlay()) {
@@ skipping 775 matching lines @@
 {
     LocalFrame* frame = page()->mainFrame() && page()->mainFrame()->isLocalFrame()
         ? page()->deprecatedLocalMainFrame() : 0;
     Element* element = focusedElement();
     if (!frame || !frame->view() || !element)
         return false;
 
     element->document().updateLayoutIgnorePendingStylesheets();
 
     bool zoomInToLegibleScale = m_webSettings->autoZoomFocusedNodeToLegibleScale()
-        && !shouldDisableDesktopWorkarounds();
+        && !page()->frameHost().visualViewport().shouldDisableDesktopWorkarounds();
 
     if (zoomInToLegibleScale) {
         // When deciding whether to zoom in on a focused text box, we should decide not to
         // zoom in if the user won't be able to zoom out. e.g if the textbox is within a
         // touch-action: none container the user can't zoom back out.
         TouchAction action = TouchActionUtil::computeEffectiveTouchAction(*element);
         if (action != TouchActionAuto && !(action & TouchActionPinchZoom))
             zoomInToLegibleScale = false;
     }
 
@@ skipping 1376 matching lines @@
     FrameView* frameView = mainFrameImpl()->frameView();
     if (!frameView)
         return;
 
     topControls().setShownRatio(topControls().shownRatio() + topControlsShownRatioDelta);
 
     FloatPoint visualViewportOffset = page()->frameHost().visualViewport().visibleRect().location();
     visualViewportOffset.move(visualViewportDelta.width, visualViewportDelta.height);
     setPageScaleFactorAndLocation(pageScaleFactor() * pageScaleDelta, visualViewportOffset);
 
-    if (pageScaleDelta != 1)
+    if (pageScaleDelta != 1) {
         m_doubleTapZoomPending = false;
+        page()->frameHost().visualViewport().userDidChangeScale();
+    }
 
     m_elasticOverscroll += elasticOverscrollDelta;
     frameView->didUpdateElasticOverscroll();
 
     ScrollableArea* layoutViewport = frameView->layoutViewportScrollableArea();
 
     DoublePoint layoutViewportPosition = layoutViewport->scrollPositionDouble()
         + DoubleSize(layoutViewportDelta.width, layoutViewportDelta.height);
 
     if (layoutViewport->scrollPositionDouble() != layoutViewportPosition) {
@@ skipping 146 matching lines @@
     }
 
     const WebMouseEvent& mouseEvent = static_cast<const WebMouseEvent&>(event);
 
     if (page())
         page()->pointerLockController().dispatchLockedMouseEvent(
             PlatformMouseEventBuilder(mainFrameImpl()->frameView(), mouseEvent),
             eventType);
 }
 
-bool WebViewImpl::shouldDisableDesktopWorkarounds()
-{
-    if (!settings()->viewportEnabled())
-        return false;
-
-    // A document is considered adapted to small screen UAs if one of these holds:
-    // 1. The author specified viewport has a constrained width that is equal to
-    //    the initial viewport width.
-    // 2. The author has disabled viewport zoom.
-
-    const PageScaleConstraints& constraints = pageScaleConstraintsSet().pageDefinedConstraints();
-
-    if (!mainFrameImpl() || !mainFrameImpl()->frameView())
-        return false;
-
-    return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
-        || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
-}
-
 void WebViewImpl::forceNextWebGLContextCreationToFail()
 {
     WebGLRenderingContext::forceNextWebGLContextCreationToFail();
 }
 
 void WebViewImpl::forceNextDrawingBufferCreationToFail()
 {
     DrawingBuffer::forceNextDrawingBufferCreationToFail();
 }
 
 void WebViewImpl::updatePageOverlays()
 {
     if (m_pageColorOverlay)
         m_pageColorOverlay->update();
     if (InspectorOverlay* overlay = inspectorOverlay()) {
         PageOverlay* inspectorPageOverlay = overlay->pageOverlay();
         if (inspectorPageOverlay)
             inspectorPageOverlay->update();
     }
 }
 
 } // namespace blink