Explicit management of FrameSelection availability

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 2406 matching lines @@
 
     Frame* focusedFrame = focusedCoreFrame();
     if (!focusedFrame->isLocalFrame())
         return info;
 
     LocalFrame* focused = toLocalFrame(focusedFrame);
     if (!focused)
         return info;
 
     FrameSelection& selection = focused->selection();
+    if (!selection.isAvailable()) {
+        // plugins/mouse-capture-inside-shadow.html reaches here.
+        return info;
+    }
     Element* element = selection.selection().rootEditableElement();
     if (!element)
         return info;
 
     info.inputMode = inputModeOfFocusedElement();
 
     info.type = textInputType();
     info.flags = textInputFlags();
     if (info.type == WebTextInputTypeNone)
         return info;
@@ skipping 28 matching lines @@
 
     return info;
 }
 
 WebTextInputType WebViewImpl::textInputType()
 {
     LocalFrame* focusedFrame = m_page->focusController().focusedFrame();
     if (!focusedFrame)
         return WebTextInputTypeNone;
 
+    if (!focusedFrame->selection().isAvailable()) {
+        // "mouse-capture-inside-shadow.html" reaches here.
+        return WebTextInputTypeNone;
+    }
+
     // It's important to preserve the equivalence of textInputInfo().type and textInputType(),
     // so perform the same rootEditableElement() existence check here for consistency.
-    if (!focusedFrame || !focusedFrame->selection().selection().rootEditableElement())
+    if (!focusedFrame->selection().selection().rootEditableElement())
         return WebTextInputTypeNone;
 
     Document* document = focusedFrame->document();
     if (!document)
         return WebTextInputTypeNone;
 
     Element* element = document->focusedElement();
     if (!element)
         return WebTextInputTypeNone;
 
@@ skipping 128 matching lines @@
 bool WebViewImpl::selectionBounds(WebRect& anchor, WebRect& focus) const
 {
     const Frame* frame = focusedCoreFrame();
     if (!frame || !frame->isLocalFrame())
         return false;
 
     const LocalFrame* localFrame = toLocalFrame(frame);
     if (!localFrame)
         return false;
     FrameSelection& selection = localFrame->selection();
+    if (!selection.isAvailable()) {
+        // plugins/mouse-capture-inside-shadow.html reaches here.
+        return false;
+    }
 
     if (selection.isCaret()) {
         anchor = focus = selection.absoluteCaretBounds();
     } else {
         const EphemeralRange selectedRange = selection.selection().toNormalizedEphemeralRange();
         if (selectedRange.isNull())
             return false;
         anchor = localFrame->editor().firstRectForRange(EphemeralRange(selectedRange.startPosition()));
         focus = localFrame->editor().firstRectForRange(EphemeralRange(selectedRange.endPosition()));
     }
@@ skipping 12 matching lines @@
     if (container && container->supportsInputMethod())
         return container->plugin();
     return nullptr;
 }
 
 bool WebViewImpl::selectionTextDirection(WebTextDirection& start, WebTextDirection& end) const
 {
     const Frame* frame = focusedCoreFrame();
     if (!frame || frame->isRemoteFrame())
         return false;
-    FrameSelection& selection = toLocalFrame(frame)->selection();
+    const FrameSelection& selection = toLocalFrame(frame)->selection();
+    if (!selection.isAvailable()) {
+        // plugins/mouse-capture-inside-shadow.html reaches here.
+        return false;
+    }
     if (selection.selection().toNormalizedEphemeralRange().isNull())
         return false;
     start = toWebTextDirection(primaryDirectionOf(*selection.start().anchorNode()));
     end = toWebTextDirection(primaryDirectionOf(*selection.end().anchorNode()));
     return true;
 }
 
 bool WebViewImpl::isSelectionAnchorFirst() const
 {
     const Frame* frame = focusedCoreFrame();
     if (!frame || frame->isRemoteFrame())
         return false;
-    return toLocalFrame(frame)->selection().selection().isBaseFirst();
+    FrameSelection& selection = toLocalFrame(frame)->selection();
+    if (!selection.isAvailable()) {
+        // plugins/mouse-capture-inside-shadow.html reaches here.
+        return false;
+    }
+    return selection.selection().isBaseFirst();
 }
 
 WebColor WebViewImpl::backgroundColor() const
 {
     if (isTransparent())
         return Color::transparent;
     if (!m_page)
         return m_baseBackgroundColor;
     if (!m_page->mainFrame())
         return m_baseBackgroundColor;
@@ skipping 1871 matching lines @@
 {
     // TODO(oshima): Investigate if this should return the ScreenInfo's scale factor rather than
     // page's scale factor, which can be 1 in use-zoom-for-dsf mode.
     if (!page())
         return 1;
 
     return page()->deviceScaleFactor();
 }
 
 } // namespace blink