Hide keyboard when omnibox loses focus

This extends what we did for ChromeHome at
https://chromium-review.googlesource.com/520712: when moving focus from
an EditText to non-editable placeholder does not automatically hide
keyboard, but restart input with TYPE_NULL, which results in a visual
glitch such as flickering of number panel on keyboard app. This can be
prevented by hiding soft input ourselves.

BUG=708259

Change-Id: I05d3714202381e42af04b3fa4ed1bf4452908beb
Reviewed-on: https://chromium-review.googlesource.com/728389Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Changwan Ryu <changwan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510134}

chrome/android/java/src/org/chromium/chrome/browser/omnibox/LocationBarLayout.java

@@ -1040,13 +1040,13 @@ public class LocationBarLayout extends FrameLayout
             }
             // Moving focus away from UrlBar(EditText) to a non-editable focus holder, such as
             // ToolbarPhone, won't automatically hide keyboard app, but restart it with TYPE_NULL,
-            // which will result in a visual glitch. We apply this logic only to ChromeHome
-            // cautiously since hiding keyboard may lower FPS of other animation effects.
-            if (mBottomSheet != null) {
-                InputMethodManager imm = (InputMethodManager) getContext().getSystemService(
-                        Context.INPUT_METHOD_SERVICE);
-                if (imm.isActive(mUrlBar)) imm.hideSoftInputFromWindow(getWindowToken(), 0, null);
-            }
+            // which will result in a visual glitch. Also, currently, we do not allow moving focus
+            // directly from omnibox to web content's form field. Therefore, we hide keyboard on
+            // focus blur indiscriminately here. Note that hiding keyboard may lower FPS of other
+            // animation effects, but we found it tolerable in an experiment.
+            InputMethodManager imm = (InputMethodManager) getContext().getSystemService(
+                    Context.INPUT_METHOD_SERVICE);
+            if (imm.isActive(mUrlBar)) imm.hideSoftInputFromWindow(getWindowToken(), 0, null);
         }
 
         if (mToolbarDataProvider.isUsingBrandColor()) {