Implement Mac Pop-up Dictionary for OOPIF.

third_party/WebKit/Source/web/mac/WebSubstringUtil.mm

Index: third_party/WebKit/Source/web/mac/WebSubstringUtil.mm
diff --git a/third_party/WebKit/Source/web/mac/WebSubstringUtil.mm b/third_party/WebKit/Source/web/mac/WebSubstringUtil.mm
index c32db74669ef2c763a1399629e7f4166298cc9fb..c04030c9edb5551cd519e8d517893860aa33e40c 100644
--- a/third_party/WebKit/Source/web/mac/WebSubstringUtil.mm
+++ b/third_party/WebKit/Source/web/mac/WebSubstringUtil.mm
@@ -53,6 +53,9 @@
 #include "public/web/WebHitTestResult.h"
 #include "public/web/WebRange.h"
 #include "public/web/WebView.h"
+#include "public/web/WebWidget.h"
+#include "web/WebFrameWidgetBase.h"
+#include "web/WebFrameWidgetImpl.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebViewImpl.h"
 
@@ -136,9 +139,15 @@ WebPoint getBaselinePoint(FrameView* frameView, const EphemeralRange& range, NSA
 
 namespace blink {
 
-NSAttributedString* WebSubstringUtil::attributedWordAtPoint(WebView* view, WebPoint point, WebPoint& baselinePoint)
+NSAttributedString* WebSubstringUtil::attributedWordAtPoint(WebView* view, WebWidget* widget, WebPoint point, WebPoint& baselinePoint)
 {
-    HitTestResult result = static_cast<WebViewImpl*>(view)->coreHitTestResultAt(point);
+    WebViewImpl* viewImpl = static_cast<WebViewImpl*>(view);
+
+    // Either this call is for a main frame's WebView or a local roots WebFrameWidgetImpl.
+    if (!viewImpl->mainFrameImpl() && !widget)
+        return nil;
+
+    HitTestResult result = viewImpl->mainFrameImpl() ? viewImpl->coreHitTestResultAt(point) : static_cast<WebFrameWidgetImpl*>(widget)->coreHitTestResultAt(point);
     if (!result.innerNode())
         return nil;
     LocalFrame* frame = result.innerNode()->document().frame();