Add password manager autocomplete suggestion when a username element in clicked.

components/autofill/content/renderer/password_autofill_agent.h

Index: components/autofill/content/renderer/password_autofill_agent.h
diff --git a/components/autofill/content/renderer/password_autofill_agent.h b/components/autofill/content/renderer/password_autofill_agent.h
index 17ae4831fe58a5aec23fe2598aa329f18ea330f7..4c9aa66daf8a37c85c298e4e6eacbb0c4afab67e 100644
--- a/components/autofill/content/renderer/password_autofill_agent.h
+++ b/components/autofill/content/renderer/password_autofill_agent.h
@@ -46,9 +46,11 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
   // cleared when the selection changes.  However, this method returns
   // true when |node| is fillable by password Autofill.
   bool DidClearAutofillSelection(const blink::WebNode& node);
-  // Shows an Autofill popup with username suggestions for |element|.
+  // Shows an Autofill popup with username suggestions for |element|. If
+  // |show_all| is |true|, will show all possible suggestions for that element,
+  // otherwise shows suggestions based on current value of |element|.
   // Returns true if any suggestions were shown, false otherwise.
-  bool ShowSuggestions(const blink::WebInputElement& element);
+  bool ShowSuggestions(const blink::WebInputElement& element, bool show_all);
 
   // Called when new form controls are inserted.
   void OnDynamicFormsSeen(blink::WebFrame* frame);
@@ -57,6 +59,9 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
   virtual bool OriginCanAccessPasswordManager(
       const blink::WebSecurityOrigin& origin);
 
+  // RenderViewObserver:
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+
  private:
   friend class PasswordAutofillAgentTest;
 
@@ -109,7 +114,6 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
   };
 
   // RenderViewObserver:
-  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void DidStartProvisionalLoad(blink::WebFrame* frame) OVERRIDE;
   virtual void DidStartLoading() OVERRIDE;
   virtual void DidFinishDocumentLoad(blink::WebFrame* frame) OVERRIDE;
@@ -132,10 +136,12 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
   void GetSuggestions(const PasswordFormFillData& fill_data,
                       const base::string16& input,
                       std::vector<base::string16>* suggestions,
-                      std::vector<base::string16>* realms);
+                      std::vector<base::string16>* realms,
+                      bool show_all);
 
   bool ShowSuggestionPopup(const PasswordFormFillData& fill_data,
-                           const blink::WebInputElement& user_input);
+                           const blink::WebInputElement& user_input,
+                           bool show_all);
 
   // Attempts to fill |username_element| and |password_element| with the
   // |fill_data|.  Will use the data corresponding to the preferred username,