Add context popup menu support for content shell[GTK].

content/shell/shell_content_browser_client.cc

Index: content/shell/shell_content_browser_client.cc
diff --git a/content/shell/shell_content_browser_client.cc b/content/shell/shell_content_browser_client.cc
index 9eb26b7b04058b27a948c2194a2ffaf34ad06871..8c2c1599391f5a164b0f783494f47afdc90da1ba 100644
--- a/content/shell/shell_content_browser_client.cc
+++ b/content/shell/shell_content_browser_client.cc
@@ -14,6 +14,7 @@
 #include "content/shell/shell_devtools_delegate.h"
 #include "content/shell/shell_resource_dispatcher_host_delegate.h"
 #include "content/shell/shell_switches.h"
+#include "content/shell/shell_web_contents_view_delegate_creator.h"
 #include "content/shell/webkit_test_runner_host.h"
 #include "googleurl/src/gurl.h"
 
@@ -63,6 +64,15 @@ std::string ShellContentBrowserClient::GetDefaultDownloadName() {
   return "download";
 }
 
+WebContentsViewDelegate* ShellContentBrowserClient::GetWebContentsViewDelegate(
+    WebContents* web_contents) {
+#if defined(TOOLKIT_GTK)
+  return CreateShellWebContentsViewDelegate(web_contents);
+#endif
+  NOTIMPLEMENTED();
+  return NULL;
+}
+
 #if defined(OS_ANDROID)
 void ShellContentBrowserClient::GetAdditionalMappedFilesForChildProcess(
     const CommandLine& command_line,