Improve "turn on Bluetooth" flow (another approach)

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

Index: chrome/android/java/src/org/chromium/chrome/browser/BluetoothChooserDialog.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/BluetoothChooserDialog.java b/chrome/android/java/src/org/chromium/chrome/browser/BluetoothChooserDialog.java
index 9bee553b1e10ce710b8af1fe7d70d2301f97be1a..cbbcd4b35319ae9aa253ec097daa451bcd8bbcbb 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/BluetoothChooserDialog.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/BluetoothChooserDialog.java
@@ -6,6 +6,7 @@ package org.chromium.chrome.browser;
 
 import android.Manifest;
 import android.app.Activity;
+import android.bluetooth.BluetoothAdapter;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
@@ -15,6 +16,7 @@ import android.text.SpannableString;
 import android.text.TextUtils;
 import android.view.View;
 
+import org.chromium.base.Log;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.chrome.R;
@@ -35,6 +37,8 @@ import org.chromium.ui.text.SpanApplier.SpanInfo;
  */
 public class BluetoothChooserDialog
         implements ItemChooserDialog.ItemSelectedCallback, WindowAndroid.PermissionCallback {
+    private static final String TAG = "Bluetooth";
+
     // These constants match BluetoothChooserAndroid::ShowDiscoveryState, and are used in
     // notifyDiscoveryState().
     static final int DISCOVERY_FAILED_TO_START = 0;
@@ -69,6 +73,12 @@ public class BluetoothChooserDialog
     // Used to keep track of when the Mode Changed Receiver is registered.
     boolean mIsLocationModeChangedReceiverRegistered;
 
+    // The local device Bluetooth adapter.
+    private final BluetoothAdapter mAdapter;
+
+    // The status message to show when the bluetooth adapter is turned off.
+    private final SpannableString mAdapterOffStatus;
+
     @VisibleForTesting
     final BroadcastReceiver mLocationModeBroadcastReceiver = new BroadcastReceiver() {
         @Override
@@ -106,6 +116,14 @@ public class BluetoothChooserDialog
         mOrigin = origin;
         mSecurityLevel = securityLevel;
         mNativeBluetoothChooserDialogPtr = nativeBluetoothChooserDialogPtr;
+        mAdapter = BluetoothAdapter.getDefaultAdapter();
+        if (mAdapter == null) {
+            Log.i(TAG, "BluetoothChooserDialog: Default Bluetooth adapter not found.");
+        }
+        mAdapterOffStatus =
+                SpanApplier.applySpans(mActivity.getString(R.string.bluetooth_adapter_off_help),
+                        new SpanInfo("<link>", "</link>",
+                                new BluetoothClickableSpan(LinkType.ADAPTER_OFF_HELP, mActivity)));
     }
 
     /**
@@ -275,9 +293,13 @@ public class BluetoothChooserDialog
                     break;
                 }
                 case ADAPTER_OFF: {
-                    Intent intent = new Intent();
-                    intent.setAction(android.provider.Settings.ACTION_BLUETOOTH_SETTINGS);
-                    mContext.startActivity(intent);
+                    if (mAdapter != null && mAdapter.enable()) {
+                        mItemChooserDialog.signalInitializingAdapter();
+                    } else {
+                        String unableToTurnOnAdapter =
+                                mActivity.getString(R.string.bluetooth_unable_to_turn_on_adapter);
+                        mItemChooserDialog.setErrorState(unableToTurnOnAdapter, mAdapterOffStatus);
+                    }
                     break;
                 }
                 case ADAPTER_OFF_HELP: {
@@ -357,12 +379,8 @@ public class BluetoothChooserDialog
                 mActivity.getString(R.string.bluetooth_adapter_off),
                 new SpanInfo("<link>", "</link>",
                         new BluetoothClickableSpan(LinkType.ADAPTER_OFF, mActivity)));
-        SpannableString adapterOffStatus = SpanApplier.applySpans(
-                mActivity.getString(R.string.bluetooth_adapter_off_help),
-                new SpanInfo("<link>", "</link>",
-                        new BluetoothClickableSpan(LinkType.ADAPTER_OFF_HELP, mActivity)));
 
-        mItemChooserDialog.setErrorState(adapterOffMessage, adapterOffStatus);
+        mItemChooserDialog.setErrorState(adapterOffMessage, mAdapterOffStatus);
     }
 
     @CalledByNative