Add abstractions that let embedders drive tests of WebContents.

content/browser/tab_contents/test_tab_contents.cc

Index: content/browser/tab_contents/test_tab_contents.cc
diff --git a/content/browser/tab_contents/test_tab_contents.cc b/content/browser/tab_contents/test_tab_contents.cc
index dc582f2321ea9878a554c6c58e312983c61a0ae5..c2feabfee254fbe993c014e7c3eb3b7caae02786 100644
--- a/content/browser/tab_contents/test_tab_contents.cc
+++ b/content/browser/tab_contents/test_tab_contents.cc
@@ -83,6 +83,10 @@ void TestTabContents::TestDidNavigateWithReferrer(
   DidNavigate(render_view_host, params);
 }
 
+WebPreferences TestTabContents::TestGetWebkitPrefs() {
+  return GetWebkitPrefs();
+}
+
 bool TestTabContents::CreateRenderViewForRenderManager(
     RenderViewHost* render_view_host) {
   // This will go to a TestRenderViewHost.
@@ -137,6 +141,11 @@ void TestTabContents::CommitPendingNavigation() {
     static_cast<RenderViewHostImpl*>(old_rvh)->OnSwapOutACK();
 }
 
+int TestTabContents::GetNumberOfFocusCalls() {
+  NOTREACHED();
+  return 0;
+}
+
 void TestTabContents::ProceedWithCrossSiteNavigation() {
   if (!pending_rvh())
     return;