Add PDF viewer example.

mojo/shell/context.cc

 // Copyright 2013 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 "mojo/shell/context.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 51 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Setup);
 };
 
 static base::LazyInstance<Setup>::Leaky setup = LAZY_INSTANCE_INITIALIZER;
 
 void InitContentHandlers(DynamicApplicationLoader* loader,
                          base::CommandLine* command_line) {
   // Default content handlers.
+  loader->RegisterContentHandler("application/pdf", GURL("mojo://pdf_viewer/"));
   loader->RegisterContentHandler("image/png", GURL("mojo://png_viewer/"));
   loader->RegisterContentHandler("text/html", GURL("mojo://html_viewer/"));
 
   // Command-line-specified content handlers.
   std::string handlers_spec = command_line->GetSwitchValueASCII(
       switches::kContentHandlers);
   if (handlers_spec.empty())
     return;
 
   std::vector<std::string> parts;
@@ skipping 179 matching lines @@
 ScopedMessagePipeHandle Context::ConnectToServiceByName(
     const GURL& application_url,
     const std::string& service_name) {
   app_urls_.insert(application_url);
   return application_manager_.ConnectToServiceByName(
       application_url, service_name).Pass();
 }
 
 }  // namespace shell
 }  // namespace mojo