[Autofill] Show a warning if the form disables Autofill.

chrome/renderer/autofill/autofill_renderer_browsertest.cc

Index: chrome/renderer/autofill/autofill_renderer_browsertest.cc
diff --git a/chrome/renderer/autofill/autofill_renderer_browsertest.cc b/chrome/renderer/autofill/autofill_renderer_browsertest.cc
index c1a5f5a4dcfd58d2ca40130ada8b1b734465c9d0..f11d228dcad6491da99e06d1ecbc969be8926d1d 100644
--- a/chrome/renderer/autofill/autofill_renderer_browsertest.cc
+++ b/chrome/renderer/autofill/autofill_renderer_browsertest.cc
@@ -173,4 +173,50 @@ TEST_F(ChromeRenderViewTest, FillFormElement) {
   EXPECT_EQ(firstname.value(), WebKit::WebString::fromUTF8("David"));
 }
 
+TEST_F(ChromeRenderViewTest, ShowAutofillWarning) {
+  // Don't want any delay for form state sync changes.  This will still post a
+  // message so updates will get coalesced, but as soon as we spin the message
+  // loop, it will generate an update.
+  SendContentStateImmediately();
+
+  LoadHTML("<form method=\"POST\" autocomplete=\"Off\">"
+           "  <input id=\"firstname\" autocomplete=\"OFF\"/>"
+           "  <input id=\"middlename\"/>"
+           "  <input id=\"lastname\"/>"
+           "</form>");
+
+  // Verify that "QueryFormFieldAutofill" isn't sent prior to a user
+  // interaction.
+  const IPC::Message* message0 = render_thread_->sink().GetFirstMessageMatching(
+      AutofillHostMsg_QueryFormFieldAutofill::ID);
+  EXPECT_EQ(static_cast<IPC::Message*>(NULL), message0);
+
+  WebFrame* web_frame = GetMainFrame();
+  WebDocument document = web_frame->document();
+  WebInputElement firstname =
+      document.getElementById("firstname").to<WebInputElement>();
+  WebInputElement middlename =
+      document.getElementById("middlename").to<WebInputElement>();
+
+  // Simulate attempting to Autofill the form from the first element, which
+  // specifies autocomplete="off".  This should still not trigger an IPC, as we
+  // don't show warnings for elements that have autocomplete="off".
+  autofill_agent_->InputElementClicked(firstname, true, true);
+  const IPC::Message* message1 = render_thread_->sink().GetFirstMessageMatching(
+      AutofillHostMsg_QueryFormFieldAutofill::ID);
+  EXPECT_EQ(static_cast<IPC::Message*>(NULL), message1);
+
+  // Simulate attempting to Autofill the form from the second element, which
+  // does not specify autocomplete="off".  This *should* trigger an IPC, as we
+  // *do* show warnings for elements that don't themselves set
+  // autocomplete="off", but for which the form does.
+  autofill_agent_->InputElementClicked(middlename, true, true);
+  const IPC::Message* message2 = render_thread_->sink().GetFirstMessageMatching(
+      AutofillHostMsg_QueryFormFieldAutofill::ID);
+  ASSERT_NE(static_cast<IPC::Message*>(NULL), message2);
+  // TODO(isherman): It would be nice to verify here that the message includes
+  // the correct data.  I'm not sure how to extract that information from an
+  // IPC::Message though.
+}
+
 }  // namespace autofill