[Android WebView] Synthesize a fake page loading event on page source modification (Re-land)

android_webview/java/src/org/chromium/android_webview/AwContents.java

 // Copyright 2012 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 org.chromium.android_webview;
 
 import android.annotation.SuppressLint;
 import android.app.Activity;
 import android.content.ComponentCallbacks2;
 import android.content.Context;
@@ skipping 31 matching lines @@
 import org.chromium.base.JNINamespace;
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.TraceEvent;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.components.navigation_interception.InterceptNavigationDelegate;
 import org.chromium.components.navigation_interception.NavigationParams;
 import org.chromium.content.browser.ContentViewClient;
 import org.chromium.content.browser.ContentViewCore;
 import org.chromium.content.browser.ContentViewStatics;
 import org.chromium.content.browser.SmartClipProvider;
-import org.chromium.content.browser.WebContentsObserver;
 import org.chromium.content.common.CleanupReference;
 import org.chromium.content_public.browser.GestureStateListener;
 import org.chromium.content_public.browser.JavaScriptCallback;
 import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.content_public.browser.NavigationController;
 import org.chromium.content_public.browser.NavigationHistory;
 import org.chromium.content_public.browser.WebContents;
 import org.chromium.content_public.browser.navigation_controller.LoadURLType;
 import org.chromium.content_public.browser.navigation_controller.UserAgentOverrideOption;
 import org.chromium.content_public.common.Referrer;
@@ skipping 134 matching lines @@
     private final AwBrowserContext mBrowserContext;
     private ViewGroup mContainerView;
     private final AwLayoutChangeListener mLayoutChangeListener;
     private final Context mContext;
     private ContentViewCore mContentViewCore;
     private WindowAndroid mWindowAndroid;
     private WebContents mWebContents;
     private NavigationController mNavigationController;
     private final AwContentsClient mContentsClient;
     private final AwContentViewClient mContentViewClient;
-    private WebContentsObserver mWebContentsObserver;
+    private AwWebContentsObserver mWebContentsObserver;
     private final AwContentsClientBridge mContentsClientBridge;
     private final AwWebContentsDelegateAdapter mWebContentsDelegate;
     private final AwContentsIoThreadClient mIoThreadClient;
     private final InterceptNavigationDelegateImpl mInterceptNavigationDelegate;
     private InternalAccessDelegate mInternalAccessAdapter;
     private final NativeGLDelegate mNativeGLDelegate;
     private final AwLayoutSizer mLayoutSizer;
     private final AwZoomControls mZoomControls;
     private final AwScrollOffsetManager mScrollOffsetManager;
     private OverScrollGlow mOverScrollGlow;
     // This can be accessed on any thread after construction. See AwContentsIoThreadClient.
     private final AwSettings mSettings;
     private final ScrollAccessibilityHelper mScrollAccessibilityHelper;
 
     private boolean mIsPaused;
     private boolean mIsViewVisible;
     private boolean mIsWindowVisible;
     private boolean mIsAttachedToWindow;
     private Bitmap mFavicon;
     private boolean mHasRequestedVisitedHistoryFromClient;
     // TODO(boliu): This should be in a global context, not per webview.
     private final double mDIPScale;
+    // Whether the WebView has attempted to do any load (including uncommitted loads).
+    private boolean mDidAttemptLoad = false;
 
     // The base background color, i.e. not accounting for any CSS body from the current page.
     private int mBaseBackgroundColor = Color.WHITE;
 
     // Must call nativeUpdateLastHitTestData first to update this before use.
     private final HitTestData mPossiblyStaleHitTestData = new HitTestData();
 
     private final DefaultVideoPosterRequestHandler mDefaultVideoPosterRequestHandler;
 
     // Bound method for suppling Picture instances to the AwContentsClient. Will be null if the
@@ skipping 661 matching lines @@
         if (wasAttached) {
             onAttachedToWindow();
             postInvalidateOnAnimation();
         }
         onSizeChanged(mContainerView.getWidth(), mContainerView.getHeight(), 0, 0);
         if (wasWindowVisible) setWindowVisibilityInternal(true);
         if (wasViewVisible) setViewVisibilityInternal(true);
         if (wasWindowFocused) onWindowFocusChanged(wasWindowFocused);
         if (wasFocused) onFocusChanged(true, 0, null);
 
+        // Popups are always assumed as having made a load attempt.
+        mDidAttemptLoad = true;

[Charlie Reis, 2015/03/03 22:21:00]

What about window.open() (with no arguments)?  That creates a new window without
navigating it, so that it stays on the initial empty document.

(Maybe that doesn't go through this case?  Or maybe it's safe to treat that as
having a load anyway?)

[mnaganov (inactive), 2015/03/04 10:30:29]

I specifically checked this case, and for WebView of the popup it delivers
callbacks indicating loading of "about:blank" page, so it doesn't actually
matter, whether anything was passed to 'window.open'. Maybe this was done for
compatibility with how old versions of WebView behave, not sure.

+
         // Restore injected JavaScript interfaces.
         for (Map.Entry<String, Pair<Object, Class>> entry : javascriptInterfaces.entrySet()) {
             @SuppressWarnings("unchecked")
             Class<? extends Annotation> requiredAnnotation = entry.getValue().second;
             mContentViewCore.addPossiblyUnsafeJavascriptInterface(
                     entry.getValue().first,
                     entry.getKey(),
                     requiredAnnotation);
         }
     }
@@ skipping 311 matching lines @@
      *
      * @return The URL of the current page or null if it's empty.
      */
     public String getUrl() {
         if (isDestroyed()) return null;
         String url =  mWebContents.getUrl();
         if (url == null || url.trim().isEmpty()) return null;
         return url;
     }
 
+    /**
+     * Gets the last committed URL. It represents the current page that is
+     * displayed in WebContents. It represents the current security context.
+     *
+     * @return The URL of the current page or null if it's empty.
+     */
+    public String getLastCommittedUrl() {
+        if (isDestroyed()) return null;
+        String url = mWebContents.getLastCommittedUrl();
+        if (url == null || url.trim().isEmpty()) return null;
+        return url;
+    }
+
     public void requestFocus() {
         mAwViewMethods.requestFocus();
     }
 
     public void setBackgroundColor(int color) {
         mBaseBackgroundColor = color;
         if (!isDestroyed()) nativeSetBackgroundColor(mNativeAwContents, color);
     }
 
     /**
@@ skipping 579 matching lines @@
     /**
      * Creates a message channel and returns the ports for each end of the channel.
      */
     public MessagePort[] createMessageChannel() {
         if (isDestroyed()) return null;
         MessagePort[] ports = mBrowserContext.getMessagePortService().createMessageChannel();
         nativeCreateMessageChannel(mNativeAwContents, ports);
         return ports;
     }
 
+    public boolean hasAccessedInitialDocument() {
+        if (isDestroyed()) return false;
+        return mWebContents.hasAccessedInitialDocument();
+    }
+
     //--------------------------------------------------------------------------------------------
     //  View and ViewGroup method implementations
     //--------------------------------------------------------------------------------------------
 
     /**
      * @see android.webkit.View#onTouchEvent()
      */
     public boolean onTouchEvent(MotionEvent event) {
         return mAwViewMethods.onTouchEvent(event);
     }
@@ skipping 214 matching lines @@
      * 3. A frame swap happens that draws the active tree into the screen
      *
      * @param requestId an id that will be returned from the callback invocation to allow
      * callers to match requests with callbacks.
      * @param callback the callback to be inserted
      */
     public void insertVisualStateCallback(long requestId, VisualStateCallback callback) {
         nativeInsertVisualStateCallback(mNativeAwContents, requestId, callback);
     }
 
+    public boolean getDidAttemptLoad() {
+        if (mDidAttemptLoad) return mDidAttemptLoad;
+        mDidAttemptLoad = mWebContentsObserver.getDidStartProvisionalLoadForFrameFired();
+        return mDidAttemptLoad;
+    }
+
     //--------------------------------------------------------------------------------------------
     //  Methods called from native via JNI
     //--------------------------------------------------------------------------------------------
 
     @CalledByNative
     private static void onDocumentHasImagesResponse(boolean result, Message message) {
         message.arg1 = result ? 1 : 0;
         message.sendToTarget();
     }
 
@@ skipping 686 matching lines @@
     private native void nativeCreatePdfExporter(long nativeAwContents, AwPdfExporter awPdfExporter);
 
     private native void nativePreauthorizePermission(long nativeAwContents, String origin,
             long resources);
 
     private native void nativePostMessageToFrame(long nativeAwContents, String frameId,
             String message, String targetOrigin, int[] msgPorts);
 
     private native void nativeCreateMessageChannel(long nativeAwContents, MessagePort[] ports);
 }