Navigation transitions: Added notifyTransitionsShown and setupTransitionsView to WebLocalFrame

Source/web/WebLocalFrameImpl.cpp

Index: Source/web/WebLocalFrameImpl.cpp
diff --git a/Source/web/WebLocalFrameImpl.cpp b/Source/web/WebLocalFrameImpl.cpp
index d246d6429bb3d4d14845836d5cef76892d60a94b..4c482dbec7e4e64c17923c276db32f38a7d8df97 100644
--- a/Source/web/WebLocalFrameImpl.cpp
+++ b/Source/web/WebLocalFrameImpl.cpp
@@ -1224,6 +1224,27 @@ void WebLocalFrameImpl::extendSelectionAndDelete(int before, int after)
     frame()->inputMethodController().extendSelectionAndDelete(before, after);
 }
 
+void WebLocalFrameImpl::beginExitTransition(const WebString& cssSelector)
+{
+    frame()->document()->hideTransitionElements(cssSelector);
+    frame()->loader().closeURL();

[abarth-chromium, 2014/07/29 17:07:15]

Will this cause us to dispatch the unload event twice?  It looks like
FrameLoader::detachFromParent also calls closeURL, and closeURL will call
dispatchUnloadEvents...

[oystein (OOO til 10th of July), 2014/07/30 22:11:51]

After discussing this with Simon, it turns out this call was something left over
from an older iteration of this and was actually no longer needed. Removed this
now, which should simplify this quite a lot and no longer introduce any
inconsistency with the unload handlers.

+    frame()->document()->styleEngine()->enableExitTransitionStylesheets();

[abarth-chromium, 2014/07/29 17:07:15]

It seems like the document is in a strange state at this point.  We've already
fired the unload event, but the document's scripts can continue to execute. 
Normally the unload even is the last thing that happens to a page before it gets
ripped out of the view...

How does this work with onbeforeunload?  Is that event fired before or after the
unload event?

Can you add tests to cover all of these cases?

+}
+
+void WebLocalFrameImpl::setIsTransitionDocument()
+{
+    // This ensures the transition UA stylesheet gets applied.
+    frame()->document()->setIsTransitionDocument();

[abarth-chromium, 2014/07/29 17:07:15]

Given that this function operates exclusively on the document, it should be an
API on WebDocument.

[oystein (OOO til 10th of July), 2014/07/30 22:11:51]

Done.

+}
+
+void WebLocalFrameImpl::navigateToSandboxedMarkup(const WebData& markup)
+{
+    ASSERT(document().securityOrigin().isUnique());
+    frame()->document()->enforceSandboxFlags(SandboxAll);
+
+    loadHTMLString(markup, document().url(), WebURL(), true);
+}
+
 void WebLocalFrameImpl::setCaretVisible(bool visible)
 {
     frame()->selection().setCaretVisible(visible);