Update zoom (aka display) density from WebView thread.

Fixes bug 5639675.

Change-Id: I982ca0787f5c050c5d1a288cd8751299ee351214

Author: mghiware

core/java/android/webkit/WebView.java

@@ -738,6 +738,7 @@ public void onTrimMemory(int level) {
     static final int SCREEN_ON                          = 136;
     static final int ENTER_FULLSCREEN_VIDEO             = 137;
     static final int UPDATE_SELECTION                   = 138;
+    static final int UPDATE_ZOOM_DENSITY                = 139;
 
     private static final int FIRST_PACKAGE_MSG_ID = SCROLL_TO_MSG_ID;
     private static final int LAST_PACKAGE_MSG_ID = SET_TOUCH_HIGHLIGHT_RECTS;
@@ -793,7 +794,9 @@ public void onTrimMemory(int level) {
         "AUTOFILL_COMPLETE", //              = 134;
         "SELECT_AT", //                      = 135;
         "SCREEN_ON", //                      = 136;
-        "ENTER_FULLSCREEN_VIDEO" //          = 137;
+        "ENTER_FULLSCREEN_VIDEO", //         = 137;
+        "UPDATE_SELECTION", //               = 138;
+        "UPDATE_ZOOM_DENSITY" //             = 139;
     };
 
     // If the site doesn't use the viewport meta tag to specify the viewport,
@@ -8431,6 +8434,11 @@ public void handleMessage(Message msg) {
                     mZoomManager.updateZoomRange(viewState, getViewWidth(), viewState.mScrollX);
                     break;
                 }
+                case UPDATE_ZOOM_DENSITY: {
+                    final float density = (Float) msg.obj;
+                    mZoomManager.updateDefaultZoomDensity(density);
+                    break;
+                }
                 case REPLACE_BASE_CONTENT: {
                     nativeReplaceBaseContent(msg.arg1);
                     break;

core/java/android/webkit/WebViewCore.java

@@ -2337,7 +2337,8 @@ private void setupViewport(boolean updateViewState) {
                     / mViewportDensityDpi;
         }
         if (adjust != mWebView.getDefaultZoomScale()) {
-            mWebView.updateDefaultZoomDensity(adjust);
+            Message.obtain(mWebView.mPrivateHandler,
+                    WebView.UPDATE_ZOOM_DENSITY, adjust).sendToTarget();
         }
         int defaultScale = (int) (adjust * 100);