android: Expose content locks in RenderWidgetHostViewAndroid

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 9dea1cf20d90e39fef4c10dde07a10e3e14892b0..dd93d05e6e54dda51d2d5bb022e0252651ce1a15 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -1532,6 +1532,28 @@ public class ContentViewCore
         nativeOnHide(mNativeContentViewCore);
     }
 
+    public boolean canLockContent() {
+        if (mNativeContentViewCore != 0)
+            return nativeCanLockContent(mNativeContentViewCore);
+        return false;
+    }
+
+    /**
+     * Lock the content so it cannot be destroyed while we have the lock.
+     */
+    public void lockContent() {
+        if (mNativeContentViewCore != 0)
+            nativeLockContent(mNativeContentViewCore);
+    }
+
+    /**
+     * Lock the content so it cannot be destroyed while we have the lock.
+     */
+    public void unlockContent() {
+        if (mNativeContentViewCore != 0)
+            nativeUnlockContent(mNativeContentViewCore);
+    }
+
     /**
      * Return the ContentSettings object used to retrieve the settings for this
      * ContentViewCore. For modifications, ChromeNativePreferences is to be used.
@@ -3482,4 +3504,10 @@ public class ContentViewCore
 
     private native void nativeExtractSmartClipData(long nativeContentViewCoreImpl,
             int x, int y, int w, int h);
+
+    private native boolean nativeCanLockContent(long nativeContentViewCoreImpl);
+
+    private native void nativeLockContent(long nativeContentViewCoreImpl);
+
+    private native void nativeUnlockContent(long nativeContentViewCoreImpl);
 }