Adding a router class to handle messages that expect responses.

build/android/lint/suppressions.xml

 <?xml version="1.0" encoding="utf-8"?>
 <lint>
   <!--
 STOP! It looks like you want to suppress some lint errors:
 - Have you tried identifing the offending patch?
   Ask the author for a fix and/or revert the patch.
 - It is preferred to add suppressions in the code instead of
   sweeping it under the rug here. See:
 
     http://developer.android.com/tools/debugging/improving-w-lint.html
 
 Still reading?
 - You can edit this file manually to suppress an issue
   globally if it is not applicable to the project.
 - You can also automatically add issues found so for in the
   build process by running:
 
     build/android/lint/suppress.py
 
   which will generate this file (Comments are not preserved).
   Note: PRODUCT_DIR will be substituted at run-time with actual
   directory path (e.g. out/Debug)
 -->
   <issue id="AllowBackup">
     <ignore path="AndroidManifest.xml"/>
   </issue>
+  <issue id="Assert">
+    <ignore regexp="mojo/public/java/src/.*"/>
+    <ignore regexp="mojo/bindings/java/src/.*"/>
+  </issue>
   <issue id="CommitPrefEdits">
     <ignore path="third_party/cacheinvalidation/src/java/com/google/ipc/invalidation/ticl/android2/channel/AndroidChannelPreferences.java"/>
   </issue>
   <issue id="DefaultLocale">
     <ignore path="third_party/cacheinvalidation/src/java/com/google/ipc/invalidation/external/client/contrib/AndroidListenerState.java"/>
   </issue>
   <issue id="DrawAllocation">
     <ignore path="content/public/android/java/src/org/chromium/content/browser/ContentViewRenderView.java"/>
     <ignore path="content/public/android/java/src/org/chromium/content/browser/PopupZoomer.java"/>
   </issue>
@@ skipping 68 matching lines @@
   </issue>
   <issue id="Recycle" severity="ignore"/>
   <issue id="Registered" severity="ignore"/>
   <issue id="SdCardPath">
     <ignore path="content/public/android/java/src/org/chromium/content/browser/MediaResourceGetter.java"/>
   </issue>
   <issue id="SetJavaScriptEnabled" severity="ignore"/>
   <issue id="ViewConstructor" severity="ignore"/>
   <issue id="WrongCall" severity="ignore"/>
 </lint>