Add hooks for capturing meaningful text info, gently.

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 436 matching lines @@
     , m_recreatingGraphicsContext(false)
     , m_flingModifier(0)
     , m_flingSourceDevice(false)
     , m_fullscreenController(FullscreenController::create(this))
     , m_showFPSCounter(false)
     , m_baseBackgroundColor(Color::white)
     , m_backgroundColorOverride(Color::transparent)
     , m_zoomFactorOverride(0)
     , m_userGestureObserved(false)
     , m_shouldDispatchFirstVisuallyNonEmptyLayout(false)
+    , m_shouldDispatchFirstLayoutAfterFinishedParsing(false)
     , m_displayMode(WebDisplayModeBrowser)
     , m_elasticOverscroll(FloatSize())
 {
     Page::PageClients pageClients;
     pageClients.chromeClient = m_chromeClientImpl.get();
     pageClients.contextMenuClient = &m_contextMenuClientImpl;
     pageClients.editorClient = &m_editorClientImpl;
     pageClients.dragClient = &m_dragClientImpl;
     pageClients.spellCheckerClient = &m_spellCheckerClientImpl;
 
@@ skipping 1425 matching lines @@
         return;
 
     PageWidgetDelegate::layout(*m_page, *mainFrameImpl()->frame());
     updateLayerTreeBackgroundColor();
     if (m_inspectorOverlay)
         m_inspectorOverlay->layout();
     for (size_t i = 0; i < m_linkHighlights.size(); ++i)
         m_linkHighlights[i]->updateGeometry();
 
     if (FrameView* view = mainFrameImpl()->frameView()) {
+        LocalFrame* frame = mainFrameImpl()->frame();
+
         if (m_shouldDispatchFirstVisuallyNonEmptyLayout && view->isVisuallyNonEmpty()) {
             m_shouldDispatchFirstVisuallyNonEmptyLayout = false;
             // TODO(esprehn): Move users of this callback to something
             // better, the heuristic for "visually non-empty" is bad.
-            mainFrameImpl()->frame()->loader().client()->dispatchDidFirstVisuallyNonEmptyLayout();
+            // TODO(dglazkov): This should likely be a WebViewClient API.
+            frame->loader().client()->dispatchDidFirstVisuallyNonEmptyLayout();
+        }
+
+        if (m_shouldDispatchFirstLayoutAfterFinishedParsing && frame->document()->hasFinishedParsing())  {
+            m_shouldDispatchFirstLayoutAfterFinishedParsing = false;
+            client()->didFirstLayoutAfterFinishedParsing();
         }
     }
 }
 
 void WebViewImpl::paint(WebCanvas* canvas, const WebRect& rect)
 {
     // This should only be used when compositing is not being used for this
     // WebView, and it is painting into the recording of its parent.
     ASSERT(!isAcceleratedCompositingActive());
 
@@ skipping 2175 matching lines @@
     } else {
         m_rootGraphicsLayer = nullptr;
         m_rootLayer = nullptr;
         m_rootTransformLayer = nullptr;
         // This means that we're transitioning to a new page. Suppress
         // commits until Blink generates invalidations so we don't
         // attempt to paint too early in the next page load.
         m_layerTreeView->setDeferCommits(true);
         m_layerTreeView->clearRootLayer();
         m_shouldDispatchFirstVisuallyNonEmptyLayout = true;
+        m_shouldDispatchFirstLayoutAfterFinishedParsing = true;
         page()->frameHost().visualViewport().clearLayersForTreeView(m_layerTreeView);
     }
 
     suppressInvalidations(false);
 }
 
 void WebViewImpl::invalidateRect(const IntRect& rect)
 {
     if (m_layerTreeView)
         updateLayerTreeViewport();
@@ skipping 294 matching lines @@
     if (m_pageColorOverlay)
         m_pageColorOverlay->update();
     if (m_inspectorOverlay) {
         PageOverlay* inspectorPageOverlay = m_inspectorOverlay->pageOverlay();
         if (inspectorPageOverlay)
             inspectorPageOverlay->update();
     }
 }
 
 } // namespace blink