bluetooth: android: Fix a couple of crashes when adapter is turned on/off.

device/bluetooth/test/android/java/src/org/chromium/device/bluetooth/Fakes.java

Index: device/bluetooth/test/android/java/src/org/chromium/device/bluetooth/Fakes.java
diff --git a/device/bluetooth/test/android/java/src/org/chromium/device/bluetooth/Fakes.java b/device/bluetooth/test/android/java/src/org/chromium/device/bluetooth/Fakes.java
index 09da34b73c374d8bb8c71e197ddfd5455fd7651c..02e9151f5f5811b54567ff5f20fc8a46ee0c3ea0 100644
--- a/device/bluetooth/test/android/java/src/org/chromium/device/bluetooth/Fakes.java
+++ b/device/bluetooth/test/android/java/src/org/chromium/device/bluetooth/Fakes.java
@@ -38,6 +38,7 @@ class Fakes {
     static class FakeBluetoothAdapter extends Wrappers.BluetoothAdapterWrapper {
         private final FakeContext mFakeContext;
         private final FakeBluetoothLeScanner mFakeScanner;
+        private boolean mPowered = true;
         final long mNativeBluetoothTestAndroid;
 
         /**
@@ -50,10 +51,10 @@ class Fakes {
         }
 
         private FakeBluetoothAdapter(long nativeBluetoothTestAndroid) {
-            super(null, new FakeContext(), new FakeBluetoothLeScanner());
+            super(null, new FakeContext());
             mNativeBluetoothTestAndroid = nativeBluetoothTestAndroid;
             mFakeContext = (FakeContext) mContext;
-            mFakeScanner = (FakeBluetoothLeScanner) mScanner;
+            mFakeScanner = new FakeBluetoothLeScanner();
         }
 
         @CalledByNative("FakeBluetoothAdapter")
@@ -66,6 +67,10 @@ class Fakes {
          */
         @CalledByNative("FakeBluetoothAdapter")
         public void discoverLowEnergyDevice(int deviceOrdinal) {
+            if (mFakeScanner == null) {
+                return;
+            }
+
             switch (deviceOrdinal) {
                 case 1: {
                     ArrayList<ParcelUuid> uuids = new ArrayList<ParcelUuid>(2);
@@ -110,17 +115,27 @@ class Fakes {
             }
         }
 
+        @CalledByNative("FakeBluetoothAdapter")
+        public void forceIllegalStateException() {
+            if (mFakeScanner != null) {
+                mFakeScanner.forceIllegalStateException();
+            }
+        }
+
         // -----------------------------------------------------------------------------------------
         // BluetoothAdapterWrapper overrides:
 
         @Override
-        public boolean isEnabled() {
-            return true;
+        public String getAddress() {
+            return "A1:B2:C3:D4:E5:F6";
         }
 
         @Override
-        public String getAddress() {
-            return "A1:B2:C3:D4:E5:F6";
+        public Wrappers.BluetoothLeScannerWrapper getBluetoothLeScanner() {
+            if (isEnabled()) {
+                return mFakeScanner;
+            }
+            return null;
         }
 
         @Override
@@ -134,9 +149,20 @@ class Fakes {
         }
 
         @Override
+        public boolean isEnabled() {
+            return mPowered;
+        }
+
+        @Override
         public boolean isDiscovering() {
             return false;
         }
+
+        @Override
+        public boolean setPowered(boolean powered) {
+            mPowered = powered;
+            return true;
+        }
     }
 
     /**
@@ -161,6 +187,7 @@ class Fakes {
      */
     static class FakeBluetoothLeScanner extends Wrappers.BluetoothLeScannerWrapper {
         public Wrappers.ScanCallbackWrapper mScanCallback;
+        private boolean mThrowException;
 
         private FakeBluetoothLeScanner() {
             super(null);
@@ -173,6 +200,9 @@ class Fakes {
                 throw new IllegalArgumentException(
                         "FakeBluetoothLeScanner does not support multiple scans.");
             }
+            if (mThrowException) {
+                throw new IllegalStateException("Adapter is off.");
+            }
             mScanCallback = callback;
         }
 
@@ -181,8 +211,15 @@ class Fakes {
             if (mScanCallback != callback) {
                 throw new IllegalArgumentException("No scan in progress.");
             }
+            if (mThrowException) {
+                throw new IllegalStateException("Adapter is off.");
+            }
             mScanCallback = null;
         }
+
+        void forceIllegalStateException() {
+            mThrowException = true;
+        }
     }
 
     /**
@@ -283,7 +320,7 @@ class Fakes {
 
         @Override
         public int getBluetoothClass_getDeviceClass() {
-            return 0x1F00; // Unspecified Device Class
+            return Wrappers.DEVICE_CLASS_UNSPECIFIED;
         }
 
         @Override