Bug 1137483 - Move search engine bar under keyboard when shown. r=liuche

This requires the window to resize when the keyboard is shown, which required a
revision in when we draw the window background.

mobile/android/base/BrowserApp.java

@@ -2634,6 +2634,16 @@ public class BrowserApp extends GeckoApp
 
         fm.beginTransaction().add(R.id.search_container, mBrowserSearch, BROWSER_SEARCH_TAG).commitAllowingStateLoss();
         mBrowserSearch.setUserVisibleHint(true);
+
+        // We want to adjust the window size when the keyboard appears to bring the
+        // SearchEngineBar above the keyboard. However, adjusting the window size
+        // when hiding the keyboard results in graphical glitches where the keyboard was
+        // because nothing was being drawn underneath (bug 933422). This can be
+        // prevented drawing content under the keyboard (i.e. in the Window).
+        //
+        // We do this here because there are glitches when unlocking a device with
+        // BrowserSearch in the foreground if we use BrowserSearch.onStart/Stop.
+        getActivity().getWindow().setBackgroundDrawableResource(android.R.color.white);
     }
 
     private void hideBrowserSearch() {
@@ -2650,6 +2660,8 @@ public class BrowserApp extends GeckoApp
         getSupportFragmentManager().beginTransaction()
                 .remove(mBrowserSearch).commitAllowingStateLoss();
         mBrowserSearch.setUserVisibleHint(false);
+
+        getWindow().setBackgroundDrawable(null);
     }
 
     /**

mobile/android/base/home/BrowserSearch.java

@@ -230,23 +230,6 @@ public class BrowserSearch extends HomeFragment
         mSearchEngines = null;
     }
 
-    @Override
-    public void onStart() {
-        super.onStart();
-
-        // Adjusting the window size when showing the keyboard results in the underlying
-        // activity being painted when the keyboard is hidden (bug 933422). This can be
-        // prevented by not resizing the window.
-        getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_NOTHING);
-    }
-
-    @Override
-    public void onStop() {
-        super.onStop();
-
-        getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
-    }
-
     @Override
     public void onResume() {
         super.onResume();

mobile/android/base/resources/layout/browser_search.xml

@@ -19,10 +19,15 @@
             android:layout_height="0dp"
             android:layout_weight="1" />
 
+    <!-- The window background is set to our desired color, #fff, so
+         reduce overdraw by not drawing the background.
+
+         Note: this needs to be transparent and not null because we
+         draw a divider in onDraw. -->
     <view class="org.mozilla.gecko.home.SearchEngineBar$SearchEngineBarContainer"
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
-          android:background="#fff">
+          android:background="@android:color/transparent">
 
         <!-- We add a marginTop so the outer container can draw a divider.
 

mobile/android/base/resources/layout/gecko_app.xml

@@ -77,7 +77,6 @@
                      android:layout_width="match_parent"
                      android:layout_height="match_parent"
                      android:layout_below="@+id/browser_chrome"
-                     android:background="@android:color/white"
                      android:visibility="invisible"/>
 
         <!-- When focus is cleared from from BrowserToolbar's EditText to