PlzNavigate: Add a browser test for basic navigations

content/public/test/test_navigation_observer.h

Index: content/public/test/test_navigation_observer.h
diff --git a/content/public/test/test_navigation_observer.h b/content/public/test/test_navigation_observer.h
index 438af744eb56c076d561664818243aa4be4aabe8..31a94d63f6d2ea2f9fb35e8fbbcf4099550ccd39 100644
--- a/content/public/test/test_navigation_observer.h
+++ b/content/public/test/test_navigation_observer.h
@@ -11,8 +11,11 @@
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/test/test_utils.h"
+#include "ui/base/page_transition_types.h"
+#include "url/gurl.h"
 
 namespace content {
+class RenderFrameHost;
 class WebContents;
 struct LoadCommittedDetails;
 
@@ -37,6 +40,10 @@ class TestNavigationObserver {
   void StartWatchingNewWebContents();
   void StopWatchingNewWebContents();
 
+  const GURL& last_navigation_url() const { return last_navigation_url_; }
+
+  int last_navigation_succeeded() const { return last_navigation_succeeded_; }
+
  protected:
   // Register this TestNavigationObserver as an observer of the |web_contents|.
   void RegisterAsObserver(WebContents* web_contents);
@@ -55,6 +62,17 @@ class TestNavigationObserver {
   void OnDidAttachInterstitialPage(WebContents* web_contents);
   void OnDidStartLoading(WebContents* web_contents);
   void OnDidStopLoading(WebContents* web_contents);
+  void OnDidStartProvisionalLoadForFrame(RenderFrameHost* render_frame_host,
+                                         const GURL& validated_url,
+                                         bool is_error_page,
+                                         bool is_iframe_srcdoc);
+  void OnDidFailProvisionalLoad(RenderFrameHost* render_frame_host,
+                                const GURL& validated_url,
+                                int error_code,
+                                const base::string16& error_description);
+  void OnDidCommitProvisionalLoadForFrame(RenderFrameHost* render_frame_host,
+                                          const GURL& url,
+                                          ui::PageTransition transition_type);
 
   // If true the navigation has started.
   bool navigation_started_;
@@ -65,6 +83,12 @@ class TestNavigationObserver {
   // The number of navigations to wait for.
   int number_of_navigations_;
 
+  // The url of the navigation that last committed.
+  GURL last_navigation_url_;
+
+  // True if the last navigation succeeded.
+  bool last_navigation_succeeded_;
+
   // The MessageLoopRunner used to spin the message loop.
   scoped_refptr<MessageLoopRunner> message_loop_runner_;