bluetooth: android: register for adapter on/off events.

chrome/android/java/src/org/chromium/chrome/browser/BluetoothChooserDialog.java

 // Copyright 2015 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.chrome.browser;
 
 import android.Manifest;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
@@ skipping 303 matching lines @@
                         new NoUnderlineClickableSpan(LinkType.ADAPTER_OFF, mContext)));
         SpannableString adapterOffStatus = SpanApplier.applySpans(
                 mContext.getString(R.string.bluetooth_adapter_off_help),
                 new SpanInfo("<link>", "</link>",
                         new NoUnderlineClickableSpan(LinkType.ADAPTER_OFF_HELP, mContext)));
 
         mItemChooserDialog.setErrorState(adapterOffMessage, adapterOffStatus);
     }
 
     @CalledByNative
+    private void notifyAdapterTurnedOn() {
+        mItemChooserDialog.clear();

[Ted C, 2016/02/26 17:50:35]

unless this line can somehow call closeDialog(), the native pointer check on the
next line can never be non-zero as this method is explicitly marked as called by
native.

[scheib, 2016/02/26 20:23:47]

Done.

+        if (mNativeBluetoothChooserDialogPtr != 0) {
+            nativeRestartSearch(mNativeBluetoothChooserDialogPtr);

[Ted C, 2016/02/26 17:50:35]

Why not have the native side just call this method right after calling
notifyAdapterTurnedOn?

[scheib, 2016/02/26 20:23:47]

Done.

+        }
+    }
+
+    @CalledByNative
     private void notifyDiscoveryState(int discoveryState) {
         switch (discoveryState) {
             case DISCOVERY_FAILED_TO_START: {
                 // FAILED_TO_START might be caused by a missing Location permission.
                 // Check, and show a request if so.
                 checkLocationPermission();
                 break;
             }
             case DISCOVERY_IDLE: {
                 mItemChooserDialog.setIdleState();
                 break;
             }
             default: {
                 // TODO(jyasskin): Report the new state to the user.
                 break;
             }
         }
     }
 
     private native void nativeOnDialogFinished(
             long nativeBluetoothChooserAndroid, int eventType, String deviceId);
     private native void nativeRestartSearch(long nativeBluetoothChooserAndroid);
     // Help links.
     private native void nativeShowBluetoothOverviewLink(long nativeBluetoothChooserAndroid);
     private native void nativeShowBluetoothAdapterOffLink(long nativeBluetoothChooserAndroid);
     private native void nativeShowNeedLocationPermissionLink(long nativeBluetoothChooserAndroid);
 }