<webview>: Add test to confirm the TAB key will escape the view.

chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc

Index: chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc
diff --git a/chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc b/chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc
index dd439fbf60ee619e27630c12bef3b599cffcb734..9585b0bbac86984feb0ae71ea3adcdebf0c16253 100644
--- a/chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc
+++ b/chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc
@@ -670,6 +670,33 @@ IN_PROC_BROWSER_TEST_P(WebViewFocusInteractiveTest, Focus_FocusEvent) {
   TestHelper("testFocusEvent", "web_view/focus", NO_TEST_SERVER);
 }
 
+IN_PROC_BROWSER_TEST_P(WebViewFocusInteractiveTest, Focus_FocusTakeFocus) {

[alexmos, 2017/03/10 07:08:33]

Since this is also a problem for OOPIFs without <webview>, it'd be great to also
have a pure OOPIF test for this, i.e., something along the lines of
SitePerProcessInteractiveBrowserTest.SequentialFocusNavigation.

[avallee, 2017/03/13 19:18:10]

Let me add this in then. Just to be clear, I think you're saying similar to the
SequentialFocusNavigation test, except that you click into the oopif and try to
navigate out (and maybe also click outside and try to navigate in).

[alexmos, 2017/03/16 17:37:11]

Yes, exactly.  I'm just thinking of following the repro steps in 674219. 
Thanks!

[avallee, 2017/05/10 18:42:16]

Test created and enabled (flaky but quite rarely) with https://crbug.com/713977

+  TestHelper("testFocusTakeFocus", "web_view/focus", NO_TEST_SERVER);
+
+  // Compute where to click in the window to focus the guest input box.
+  int clickX, clickY;
+  EXPECT_TRUE(content::ExecuteScriptAndExtractInt(
+      embedder_web_contents(),
+      "domAutomationController.send(Math.floor(window.clickX));", &clickX));
+  EXPECT_TRUE(content::ExecuteScriptAndExtractInt(
+      embedder_web_contents(),
+      "domAutomationController.send(Math.floor(window.clickY));", &clickY));
+
+  ExtensionTestMessageListener next_step_listener("TEST_STEP_PASSED", false);
+  next_step_listener.set_failure_message("TEST_STEP_FAILED");
+  content::SimulateMouseClickAt(
+      (GetParam() ? guest_web_contents() : embedder_web_contents()), 0,
+      blink::WebMouseEvent::Button::Left, gfx::Point(clickX, clickY));
+  ASSERT_TRUE(next_step_listener.WaitUntilSatisfied());
+
+  // TAB back out to the embedder's input.
+  next_step_listener.Reset();
+  content::SimulateKeyPress(embedder_web_contents(), ui::DomKey::TAB,
+                            ui::DomCode::TAB, ui::VKEY_TAB, false, false, false,
+                            false);
+  ASSERT_TRUE(next_step_listener.WaitUntilSatisfied());
+}
+
 IN_PROC_BROWSER_TEST_P(WebViewFocusInteractiveTest, Focus_FocusTracksEmbedder) {
   content::WebContents* embedder_web_contents = NULL;