MacViews: Implement Full Keyboard Access.

ui/views/focus/focus_traversal_unittest.cc

Index: ui/views/focus/focus_traversal_unittest.cc
diff --git a/ui/views/focus/focus_traversal_unittest.cc b/ui/views/focus/focus_traversal_unittest.cc
index 039c2b647a314143a24aa04c40e3c1365edc3d5f..6cd95b8c995ce40dd48cb6d2e124aabbbb61a8fb 100644
--- a/ui/views/focus/focus_traversal_unittest.cc
+++ b/ui/views/focus/focus_traversal_unittest.cc
@@ -603,6 +603,77 @@ TEST_F(FocusTraversalTest, NormalTraversal) {
   }
 }
 
+#if defined(OS_MACOSX)
+// Test focus traversal with full keyboard access off on Mac.
+TEST_F(FocusTraversalTest, NormalTraversalMac) {
+GetFocusManager()->SetKeyboardAccessible(false);

[tapted, 2016/04/20 06:05:58]

indenting is off here

[karandeepb, 2016/05/03 02:54:13]

Done.

+
+// Now only views with FocusBehavior of ALWAYS will be focusable.
+const int kTraversalIDs[] = { kAppleTextfieldID,
+      kOrangeTextfieldID, kBananaTextfieldID, kKiwiTextfieldID,
+      kStyleTextEditID,
+      kSearchTextfieldID,
+      kThumbnailContainerID};
+
+  // Let's traverse the whole focus hierarchy (several times, to make sure it

[tapted, 2016/04/20 06:05:58]

I think this needs to be a helper function - it's too much code to copy-paste.
You could call it here with something like

SCOPED_TRACE("NormalTraversalMac");
AdvanceEntireFocusLoop(begin(kTraversalIDs), end(ktraversalIDs));

[karandeepb, 2016/05/03 02:54:13]

Done. Turns out there were many other similar calls

+  // loops OK).
+  GetFocusManager()->ClearFocus();
+  for (int i = 0; i < 3; ++i) {
+    for (size_t j = 0; j < arraysize(kTraversalIDs); j++) {
+      GetFocusManager()->AdvanceFocus(false);
+      View* focused_view = GetFocusManager()->GetFocusedView();
+      EXPECT_TRUE(focused_view != NULL);

[tapted, 2016/04/20 06:05:58]

I think 

EXPECT_NE(nullptr, focused_view)

is the latest fashion for these checks

[karandeepb, 2016/05/03 02:54:13]

Done.

+      if (focused_view)
+        EXPECT_EQ(kTraversalIDs[j], focused_view->id());
+    }
+  }
+
+  // Let's traverse in reverse order.
+  GetFocusManager()->ClearFocus();
+  for (int i = 0; i < 3; ++i) {
+    for (int j = arraysize(kTraversalIDs) - 1; j >= 0; --j) {
+      GetFocusManager()->AdvanceFocus(true);
+      View* focused_view = GetFocusManager()->GetFocusedView();
+      EXPECT_TRUE(focused_view != NULL);
+      if (focused_view)
+        EXPECT_EQ(kTraversalIDs[j], focused_view->id());
+    }
+  }
+}
+
+// Test toggling full keyboard access correctly changes the focused view on Mac.
+TEST_F(FocusTraversalTest, FullKeyboardToggle) {
+  // Give focus to kTopCheckBoxID .
+  FindViewByID(kTopCheckBoxID)->RequestFocus();
+  EXPECT_EQ(kTopCheckBoxID, GetFocusManager()->GetFocusedView()->id());
+
+  // Turn off full keyboard access. Focus should move to next view with ALWAYS
+  // focus behavior.
+  GetFocusManager()->SetKeyboardAccessible(false);
+  EXPECT_EQ(kAppleTextfieldID, GetFocusManager()->GetFocusedView()->id());
+
+  // Turning on full keyboard access should not change the focused view.
+  GetFocusManager()->SetKeyboardAccessible(true);
+  EXPECT_EQ(kAppleTextfieldID, GetFocusManager()->GetFocusedView()->id());
+
+  // Give focus to kSearchButtonID.
+  FindViewByID(kSearchButtonID)->RequestFocus();
+  EXPECT_EQ(kSearchButtonID, GetFocusManager()->GetFocusedView()->id());
+
+  // Turn off full keyboard access. Focus should move to next view with ALWAYS
+  // focus behavior.
+  GetFocusManager()->SetKeyboardAccessible(false);
+  EXPECT_EQ(kThumbnailContainerID, GetFocusManager()->GetFocusedView()->id());
+
+  // See focus advances correctly in both directions.
+  GetFocusManager()->AdvanceFocus(false);
+  EXPECT_EQ(kAppleTextfieldID, GetFocusManager()->GetFocusedView()->id());
+
+  GetFocusManager()->AdvanceFocus(true);
+  EXPECT_EQ(kThumbnailContainerID, GetFocusManager()->GetFocusedView()->id());
+}
+#endif

[tapted, 2016/04/20 06:05:58]

nit:  // OS_MACOSX

[karandeepb, 2016/05/03 02:54:13]

Done.

+
 TEST_F(FocusTraversalTest, TraversalWithNonEnabledViews) {
   const int kDisabledIDs[] = {
       kBananaTextfieldID, kFruitCheckBoxID, kComboboxID, kAsparagusButtonID,