Adds link disambiguation popup support to Windows.

content/browser/renderer_host/render_widget_host_impl.cc

 // 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_impl.h"
 
 #include <math.h>
 #include <set>
 #include <utility>
 
@@ skipping 1619 matching lines @@
     GetProcess()->ReceivedBadMessage();
     return;
   }
 
   DCHECK(bitmap->pixels());
 
   SkImageInfo info = SkImageInfo::MakeN32Premul(size.width(), size.height());
   SkBitmap zoomed_bitmap;
   zoomed_bitmap.installPixels(info, bitmap->pixels(), info.minRowBytes());
 
-#if defined(OS_ANDROID)
+#if defined(OS_ANDROID) || defined(OS_WIN)
+  // Note that |rect| is in coordinates of pixels relative to the window origin.
+  // Aura-based systems will want to convert this to DIPs.
   if (view_)
     view_->ShowDisambiguationPopup(rect, zoomed_bitmap);
 #else
   NOTIMPLEMENTED();
 #endif
 
+  // It is assumed that the disambiguation popup will make a copy of the
+  // provided zoomed image, so we delete this one.
   zoomed_bitmap.setPixels(0);
   Send(new ViewMsg_ReleaseDisambiguationPopupBitmap(GetRoutingID(), id));
 }
 
 #if defined(OS_WIN)
 void RenderWidgetHostImpl::OnWindowlessPluginDummyWindowCreated(
     gfx::NativeViewId dummy_activation_window) {
   HWND hwnd = reinterpret_cast<HWND>(dummy_activation_window);
 
   // This may happen as a result of a race condition when the plugin is going
@@ skipping 595 matching lines @@
 }
 #endif
 
 SkColorType RenderWidgetHostImpl::PreferredReadbackFormat() {
   if (view_)
     return view_->PreferredReadbackFormat();
   return kN32_SkColorType;
 }
 
 }  // namespace content