Add "Open with <ARC-app-name>" items to the context menu

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 68527c38746f6c0607ccde2b37150ae932d69710..f2023b8d6ec45c0a3b16d554655223e46d491393 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -720,6 +720,15 @@ are declared in build/common.gypi.
           <message name="IDS_CONTENT_CONTEXT_GENERATEPASSWORD" desc="The name of the Generate Password command in the content area context menu">
             Generate password
           </message>
+          <message name="IDS_CONTENT_CONTEXT_MORE_ARC_APPS" desc="The label for the parent item of the sub menu in the content area context menu. The sub menu contains ARC app names.">
+            More
+          </message>
+          <message name="IDS_CONTENT_CONTEXT_OPEN_WITH_ARC_APP" desc="The label for an item in the content area context menu for launching an ARC app.">
+            Open with <ph name="APP">$1<ex>Hangout</ex></ph>
+          </message>
+          <message name="IDS_CONTENT_CONTEXT_LOADING_ARC_APP_NAMES" desc="he place-holder message shown while Chrome is waiting for a reply from ARC.">

[hidehiko, 2016/03/07 14:40:07]

nit s/he/The/

[Yusuke Sato, 2016/03/07 22:25:16]

Done.

+            Loading
+          </message>
         </if>
         <if expr="use_titlecase">
           <message name="IDS_CONTENT_CONTEXT_BACK" desc="In Title Case: The name of the Back command in the content area context menu">