Web Share: Show a warning prompt when share is used from incognito.

chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java
index f49b85010197454f3967602b4b0e39ad6b629b2c..de6f5ad6d814e01282d0b10de76bf6a47e97ad59 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webshare/ShareServiceImpl.java
@@ -6,9 +6,13 @@ package org.chromium.chrome.browser.webshare;
 
 import android.app.Activity;
 import android.content.ComponentName;
+import android.content.DialogInterface;
+import android.content.DialogInterface.OnCancelListener;
+import android.content.DialogInterface.OnClickListener;
 import android.support.annotation.Nullable;
 
 import org.chromium.base.metrics.RecordHistogram;
+import org.chromium.chrome.browser.externalnav.ExternalNavigationDelegateImpl;
 import org.chromium.chrome.browser.share.ShareHelper;
 import org.chromium.content.browser.ContentViewCore;
 import org.chromium.content_public.browser.WebContents;
@@ -23,6 +27,7 @@ import org.chromium.ui.base.WindowAndroid;
  */
 public class ShareServiceImpl implements ShareService {
     private final Activity mActivity;
+    private final boolean mIsIncognito;
 
     // These numbers are written to histograms. Keep in sync with WebShareMethod enum in
     // histograms.xml, and don't reuse or renumber entries (except for the _COUNT entry).
@@ -40,6 +45,7 @@ public class ShareServiceImpl implements ShareService {
 
     public ShareServiceImpl(@Nullable WebContents webContents) {
         mActivity = activityFromWebContents(webContents);
+        mIsIncognito = webContents.isIncognito();
     }
 
     @Override
@@ -60,6 +66,28 @@ public class ShareServiceImpl implements ShareService {
             return;
         }
 
+        if (mIsIncognito) {
+            // In incognito mode, confirm with the user before sending intent externally.
+            showIncognitoWarningDialog(title, text, url, callback);
+        } else {
+            startShare(title, text, url, callback);
+        }
+    }
+
+    @Nullable
+    private static Activity activityFromWebContents(@Nullable WebContents webContents) {
+        if (webContents == null) return null;
+
+        ContentViewCore contentViewCore = ContentViewCore.fromWebContents(webContents);
+        if (contentViewCore == null) return null;
+
+        WindowAndroid window = contentViewCore.getWindowAndroid();
+        if (window == null) return null;
+
+        return window.getActivity().get();
+    }
+
+    private void startShare(String title, String text, Url url, final ShareResponse callback) {
         ShareHelper.TargetChosenCallback innerCallback = new ShareHelper.TargetChosenCallback() {
             public void onTargetChosen(ComponentName chosenComponent) {
                 RecordHistogram.recordEnumeratedHistogram("WebShare.ShareOutcome",
@@ -68,25 +96,33 @@ public class ShareServiceImpl implements ShareService {
             }
 
             public void onCancel() {
-                RecordHistogram.recordEnumeratedHistogram("WebShare.ShareOutcome",
-                        WEBSHARE_OUTCOME_CANCELED, WEBSHARE_OUTCOME_COUNT);
-                callback.call("Share canceled");
+                cancelShare(callback);
             }
         };
 
         ShareHelper.share(false, false, mActivity, title, text, url.url, null, null, innerCallback);
     }
 
-    @Nullable
-    private static Activity activityFromWebContents(@Nullable WebContents webContents) {
-        if (webContents == null) return null;
-
-        ContentViewCore contentViewCore = ContentViewCore.fromWebContents(webContents);
-        if (contentViewCore == null) return null;
-
-        WindowAndroid window = contentViewCore.getWindowAndroid();
-        if (window == null) return null;
+    private static void cancelShare(ShareResponse callback) {
+        RecordHistogram.recordEnumeratedHistogram("WebShare.ShareOutcome",
+                WEBSHARE_OUTCOME_CANCELED, WEBSHARE_OUTCOME_COUNT);
+        callback.call("Share canceled");
+    }
 
-        return window.getActivity().get();
+    private void showIncognitoWarningDialog(final String title, final String text, final Url url,
+            final ShareResponse callback) {
+        ExternalNavigationDelegateImpl.showLeaveIncognitoWarningDialog(mActivity,
+                new OnClickListener() {
+                    @Override
+                    public void onClick(DialogInterface dialog, int which) {
+                        startShare(title, text, url, callback);
+                    }
+                },
+                new OnCancelListener() {
+                    @Override
+                    public void onCancel(DialogInterface dialog) {
+                        cancelShare(callback);
+                    }
+                });
     }
 }