bluetooth: Increase min api for Android

device/bluetooth/android/java/src/org/chromium/device/bluetooth/ChromeBluetoothDevice.java

Index: device/bluetooth/android/java/src/org/chromium/device/bluetooth/ChromeBluetoothDevice.java
diff --git a/device/bluetooth/android/java/src/org/chromium/device/bluetooth/ChromeBluetoothDevice.java b/device/bluetooth/android/java/src/org/chromium/device/bluetooth/ChromeBluetoothDevice.java
index ebe9f07ecc17dd9bfd3766920daa0b82ac47fb17..3d1b4444db2eef1c0f101fdcb59b1850e849e8d4 100644
--- a/device/bluetooth/android/java/src/org/chromium/device/bluetooth/ChromeBluetoothDevice.java
+++ b/device/bluetooth/android/java/src/org/chromium/device/bluetooth/ChromeBluetoothDevice.java
@@ -24,7 +24,7 @@ import java.util.HashMap;
  * Lifetime is controlled by device::BluetoothDeviceAndroid.
  */
 @JNINamespace("device")
-@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+@TargetApi(Build.VERSION_CODES.M)
 final class ChromeBluetoothDevice {
     private static final String TAG = "Bluetooth";
 
@@ -109,7 +109,9 @@ final class ChromeBluetoothDevice {
         // autoConnect set to false as under experimentation using autoConnect failed to complete
         // connections.
         mBluetoothGatt =
-                mDevice.connectGatt(context, false /* autoConnect */, mBluetoothGattCallbackImpl);
+                mDevice.connectGatt(context, false /* autoConnect */, mBluetoothGattCallbackImpl,
+                        // Prefer LE for dual-mode devices due to lower energy consumption.
+                        BluetoothDevice.TRANSPORT_LE);
     }
 
     // Implements BluetoothDeviceAndroid::DisconnectGatt.