Basic autofill into password value on user gesture only.

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 503621bfda784a66f10f0c755a7f1af015e40b47..9bc50b88932636374f360c2bdec80157efe7a054 100644
--- a/components/autofill/content/renderer/password_autofill_agent.h
+++ b/components/autofill/content/renderer/password_autofill_agent.h
@@ -13,6 +13,7 @@
 #include "components/autofill/core/common/password_form_fill_data.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "third_party/WebKit/public/web/WebInputElement.h"
+#include "third_party/WebKit/public/web/WebUserGestureIndicator.h"
 
 namespace blink {
 class WebInputElement;
@@ -79,6 +80,22 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
   typedef std::map<blink::WebFrame*,
                    linked_ptr<PasswordForm> > FrameToPasswordFormMap;
 
+  class AutofillWebUserGestureHandler : public blink::WebUserGestureHandler {
+   public:
+    AutofillWebUserGestureHandler(PasswordAutofillAgent* agent);
+    virtual ~AutofillWebUserGestureHandler();
+
+    void addElement(blink::WebInputElement* element) {
+      elements_.push_back(element);
+    }
+
+    virtual void onGesture();
+
+   private:
+    PasswordAutofillAgent* agent_;
+    std::vector<blink::WebInputElement*> elements_;
+  };
+
   // RenderViewObserver:
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void DidStartProvisionalLoad(blink::WebFrame* frame) OVERRIDE;
@@ -144,6 +161,10 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
   blink::WebFrame* CurrentOrChildFrameWithSavedForms(
       const blink::WebFrame* current_frame);
 
+  void setUserGestureOccurred(bool occurred) {

[Garrett Casto, 2013/12/02 23:49:12]

Inline functions like this are generally also done in hacker_case, so
set_user_gesture_occurred(). http://www.chromium.org/developers/coding-style

[jww, 2013/12/03 06:29:59]

Done.

+    userGestureOccurred_ = occurred;
+  }
+
   // The logins we have filled so far with their associated info.
   LoginToPasswordInfoMap login_to_password_info_;
 
@@ -159,6 +180,10 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
 
   base::WeakPtrFactory<PasswordAutofillAgent> weak_ptr_factory_;

[Garrett Casto, 2013/12/02 23:49:12]

WeakPtrFactory should always be the last member variable. See
https://code.google.com/p/chromium/codesearch#chromium/src/base/memory/weak_p...

[jww, 2013/12/03 06:29:59]

Done.

 
+  AutofillWebUserGestureHandler* gestureHandler_;

[Garrett Casto, 2013/12/02 23:49:12]

These should be unix_hacker_style_ not mixedCase_.
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml?showone=Variab...

[jww, 2013/12/03 06:29:59]

Done.

+
+  bool userGestureOccurred_;
+
   DISALLOW_COPY_AND_ASSIGN(PasswordAutofillAgent);
 };