Fix context menu positioning in MimeHandlerViewGuest.

Fix context menu positioning in MimeHandlerViewGuest.

BUG=422641
Test=Load chrome with the following flags:
--out-of-process-pdf, --enable-mime-handler-view
Load a PDF in a <webview>, e.g. use the webview-sample/browser app:
https://chrome.google.com/webstore/detail/edggnmnajhcbhlnpjnogkjpghaikidaa
and navigate to a PDF.
Right clicking the PDF should bring context menu to correct
position relative to the cursor.

Committed: https://crrev.com/b4adc139a023f5e77cabc715f46e3c4e0e432105
Cr-Commit-Position: refs/heads/master@{#300639}

[lazyboy, 2014-10-21 20:39:50]

lazyboy@chromium.org changed reviewers:
+ fsamuel@chromium.org

[Fady Samuel, 2014-10-21 21:39:42]

lgtm

[lazyboy, 2014-10-22 02:25:38]

lazyboy@chromium.org changed reviewers:
+ rockot@chromium.org

[lazyboy, 2014-10-22 02:25:38]

+Ken for *.gyp and *.gn changes.

[Ken Rockot(use gerrit already), 2014-10-22 02:28:01]

lgtm

[lazyboy, 2014-10-22 03:00:17]

The CQ bit was checked by lazyboy@chromium.org

[commit-bot: I haz the power, 2014-10-22 03:00:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/667273002/20001

[commit-bot: I haz the power, 2014-10-22 04:15:29]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-10-22 04:15:31]

Failed to apply patch for
chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc:
While running git apply --index -3 -p1;
  error: patch failed:
chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc:50
  Falling back to three-way merge...
  Applied patch to
'chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc'
with conflicts.
  U
chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc

Patch:      
chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc
Index:
chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc
diff --git
a/chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc
b/chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc
index
46b0952bb67545111e2afabdc1513081ab9acc40..76637a0491cef1d0a77db9243669518f13c4f9d8
100644
---
a/chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc
+++
b/chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.cc
@@ -5,8 +5,10 @@
 #include
"chrome/browser/guest_view/mime_handler_view/chrome_mime_handler_view_guest_delegate.h"
 
 #include "chrome/browser/chrome_page_zoom.h"
+#include "chrome/browser/renderer_context_menu/render_view_context_menu.h"
 #include "chrome/browser/ui/pdf/chrome_pdf_web_contents_helper_client.h"
 #include "components/pdf/browser/pdf_web_contents_helper.h"
+#include "components/renderer_context_menu/context_menu_delegate.h"
 #include
"extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h"
 
 #if defined(ENABLE_PRINTING)
@@ -50,3 +52,16 @@ void ChromeMimeHandlerViewGuestDelegate::ChangeZoom(bool
zoom_in) {
       guest_->embedder_web_contents(),
       zoom_in ? content::PAGE_ZOOM_IN : content::PAGE_ZOOM_OUT);
 }
+
+bool ChromeMimeHandlerViewGuestDelegate::HandleContextMenu(
+    content::WebContents* web_contents,
+    const content::ContextMenuParams& params) {
+  ContextMenuDelegate* menu_delegate =
+      ContextMenuDelegate::FromWebContents(web_contents);
+  DCHECK(menu_delegate);
+
+  scoped_ptr<RenderViewContextMenu> menu =
+      menu_delegate->BuildMenu(web_contents, params);
+  menu_delegate->ShowMenu(menu.Pass());
+  return true;
+}

[commit-bot: I haz the power, 2014-10-22 04:15:49]

The CQ bit was unchecked by commit-bot@chromium.org

[lazyboy, 2014-10-22 05:39:35]

The CQ bit was checked by lazyboy@chromium.org

[commit-bot: I haz the power, 2014-10-22 05:40:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/667273002/40001

[commit-bot: I haz the power, 2014-10-22 06:29:34]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2014-10-22 06:30:38]

Patchset 3 (id:??) landed as
https://crrev.com/b4adc139a023f5e77cabc715f46e3c4e0e432105
Cr-Commit-Position: refs/heads/master@{#300639}