[WebView] initial webview-side implementation of safebrowsing

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.annotation.TargetApi;
 import android.app.Activity;
 import android.content.ComponentCallbacks2;
@@ skipping 2835 matching lines @@
         final int scrollRangeY = mScrollOffsetManager.computeMaximumVerticalScrollOffset();
         // absorbGlow() will release the glow if it is not finished.
         mOverScrollGlow.absorbGlow(x, y, oldX, oldY, scrollRangeX, scrollRangeY,
                 (float) Math.hypot(velocityX, velocityY));
 
         if (mOverScrollGlow.isAnimating()) {
             postInvalidateOnAnimation();
         }
     }
 
+    @CalledByNative
+    private boolean canShowInterstitial() {
+        int loc[] = new int[2];
+        mContainerView.getLocationOnScreen(loc);
+        // TODO(sgurun) implement a better strategy here.
+        if (mContainerView.getWidth() < 500 || mContainerView.getHeight() < 500) {
+            return false;
+        }
+        if (mContainerView.getVisibility() != View.VISIBLE) {
+            return false;
+        }
+        // TODO(timvolodine) other potential improvements mentioned:
+        // consider content, not attached webviews, giant webviews, ..
+        return true;
+    }
+
     // -------------------------------------------------------------------------------------------
     // Helper methods
     // -------------------------------------------------------------------------------------------
 
     private void setPageScaleFactorAndLimits(
             float pageScaleFactor, float minPageScaleFactor, float maxPageScaleFactor) {
         if (mPageScaleFactor == pageScaleFactor
                 && mMinPageScaleFactor == minPageScaleFactor
                 && mMaxPageScaleFactor == maxPageScaleFactor) {
             return;
@@ skipping 510 matching lines @@
 
     private native void nativePostMessageToFrame(long nativeAwContents, String frameId,
             String message, String targetOrigin, int[] msgPorts);
 
     private native void nativeCreateMessageChannel(
             long nativeAwContents, AppWebMessagePort[] ports);
 
     private native void nativeGrantFileSchemeAccesstoChildProcess(long nativeAwContents);
     private native void nativeResumeLoadingCreatedPopupWebContents(long nativeAwContents);
 }