Fix dictionary look-up for highlighted text in Mac.

content/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <Carbon/Carbon.h>
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
@@ skipping 2355 matching lines @@
     return;
   }
   dispatch_async(dispatch_get_main_queue(), ^{
     [view showDefinitionForAttributedString:string
                                     atPoint:baselinePoint];
   });
 }
 
 - (void)showLookUpDictionaryOverlayFromRange:(NSRange)range
                                   targetView:(NSView*)targetView {
+  RenderWidgetHostImpl* widgetHost = renderWidgetHostView_->render_widget_host_;
+  if (!widgetHost || !widgetHost->delegate())
+    return;
+  widgetHost = widgetHost->delegate()->GetFocusedRenderWidgetHost(widgetHost);
+
+  if (!widgetHost)
+    return;
+
+  // TODO(ekaramad): The position reported by the renderer is with respect to
+  // |widgetHost|'s coordinate space with y-axis inverted to conform to AppKit
+  // coordinate system. The point will need to be transformed into root view's
+  // coordinate system (RenderWidgetHostViewMac in this case). However, since
+  // the callback is invoked on IO thread it will require some thread hopping to
+  // do so. For this reason, for now, we accept this non-ideal way of fixing the
+  // point offset manually from the view bounds. This should be revisited when
+  // fixing issues in TextInputClientMac (https://crbug.com/643233).
+  gfx::Rect root_box = renderWidgetHostView_->GetViewBounds();
+  gfx::Rect view_box = widgetHost->GetView()->GetViewBounds();
+
   TextInputClientMac::GetInstance()->GetStringFromRange(
-      renderWidgetHostView_->render_widget_host_, range,
-      ^(NSAttributedString* string, NSPoint baselinePoint) {
+      widgetHost, range, ^(NSAttributedString* string, NSPoint baselinePoint) {
+        baselinePoint.x += view_box.origin().x() - root_box.origin().x();
+        baselinePoint.y +=
+            root_box.bottom_left().y() - view_box.bottom_left().y();
         [self showLookUpDictionaryOverlayInternal:string
                                     baselinePoint:baselinePoint
                                        targetView:targetView];
-      }
-  );
+      });
 }
 
 - (void)showLookUpDictionaryOverlayAtPoint:(NSPoint)point {
   gfx::Point rootPoint(point.x, NSHeight([self frame]) - point.y);
   gfx::Point transformedPoint;
   if (!renderWidgetHostView_->render_widget_host_ ||
       !renderWidgetHostView_->render_widget_host_->delegate() ||
       !renderWidgetHostView_->render_widget_host_->delegate()
            ->GetInputEventRouter())
     return;
@@ skipping 1002 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end