aw: Fix WebViewDatabaseAdapter threading

android_webview/glue/java/src/com/android/webview/chromium/WebViewDatabaseAdapter.java

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package com.android.webview.chromium;
 
 import android.webkit.WebViewDatabase;
 
 import org.chromium.android_webview.AwFormDatabase;
 import org.chromium.android_webview.HttpAuthDatabase;
+import org.chromium.base.ThreadUtils;
+
+import java.util.concurrent.Callable;
 
 /**
  * Chromium implementation of WebViewDatabase -- forwards calls to the
  * chromium internal implementation.
  */
 @SuppressWarnings("deprecation")
 final class WebViewDatabaseAdapter extends WebViewDatabase {
-    private HttpAuthDatabase mHttpAuthDatabase;
+    private final WebViewChromiumFactoryProvider mFactory;
+    private final HttpAuthDatabase mHttpAuthDatabase;
 
-    public WebViewDatabaseAdapter(HttpAuthDatabase httpAuthDatabase) {
+    public WebViewDatabaseAdapter(
+            WebViewChromiumFactoryProvider factory, HttpAuthDatabase httpAuthDatabase) {
+        mFactory = factory;
         mHttpAuthDatabase = httpAuthDatabase;
     }
 
     @Override
     public boolean hasUsernamePassword() {
         // This is a deprecated API: intentional no-op.
         return false;
     }
 
     @Override
     public void clearUsernamePassword() {
         // This is a deprecated API: intentional no-op.
     }
 
     @Override
     public boolean hasHttpAuthUsernamePassword() {
+        if (checkNeedsPost()) {
+            return mFactory.runOnUiThreadBlocking(new Callable<Boolean>() {
+                @Override
+                public Boolean call() {
+                    return mHttpAuthDatabase.hasHttpAuthUsernamePassword();
+                }
+
+            });
+        }
         return mHttpAuthDatabase.hasHttpAuthUsernamePassword();
     }
 
     @Override
     public void clearHttpAuthUsernamePassword() {
+        if (checkNeedsPost()) {
+            mFactory.addTask(new Runnable() {
+                @Override
+                public void run() {
+                    mHttpAuthDatabase.clearHttpAuthUsernamePassword();
+                }
+
+            });
+            return;
+        }
         mHttpAuthDatabase.clearHttpAuthUsernamePassword();
     }
 
     @Override
     public boolean hasFormData() {
+        if (checkNeedsPost()) {
+            return mFactory.runOnUiThreadBlocking(new Callable<Boolean>() {
+                @Override
+                public Boolean call() {
+                    return AwFormDatabase.hasFormData();
+                }
+
+            });
+        }
         return AwFormDatabase.hasFormData();
     }
 
     @Override
     public void clearFormData() {
+        if (checkNeedsPost()) {
+            mFactory.addTask(new Runnable() {
+                @Override
+                public void run() {
+                    AwFormDatabase.clearFormData();
+                }
+
+            });
+            return;
+        }
         AwFormDatabase.clearFormData();
     }
+
+    private static boolean checkNeedsPost() {
+        // Init is guaranteed to have happened if a WebViewDatabaseAdapter is created, so do not
+        // need to check WebViewChromiumFactoryProvider.hasStarted.
+        return !ThreadUtils.runningOnUiThread();
+    }
 }