Add BlimpClientContext and factory with real and dummy implementation

blimp/client/core/android/java/src/org/chromium/blimp/core/DummyBlimpClientContext.java

Index: blimp/client/core/android/java/src/org/chromium/blimp/core/DummyBlimpClientContext.java
diff --git a/blimp/client/core/android/java/src/org/chromium/blimp/core/DummyBlimpClientContext.java b/blimp/client/core/android/java/src/org/chromium/blimp/core/DummyBlimpClientContext.java
new file mode 100644
index 0000000000000000000000000000000000000000..5818312073aec6b97d969fcde1ef5aa8869e6cd8
--- /dev/null
+++ b/blimp/client/core/android/java/src/org/chromium/blimp/core/DummyBlimpClientContext.java
@@ -0,0 +1,46 @@
+// Copyright 2016 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.blimp.core;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+import org.chromium.blimp_public.BlimpClientContext;
+import org.chromium.blimp_public.BlimpContents;
+
+/**
+ * A dummy implementation of the {@link BlimpClientContext}.
+ */
+@JNINamespace("blimp::client")
+public class DummyBlimpClientContext implements BlimpClientContext {
+    @CalledByNative
+    private static DummyBlimpClientContext create(long nativeDummyBlimpClientContextAndroid) {
+        return new DummyBlimpClientContext(nativeDummyBlimpClientContextAndroid);
+    }
+
+    /**
+     * The pointer to the DummyBlimpClientContextAndroid JNI bridge.
+     */
+    private long mNativeDummyBlimpClientContextAndroid;
+
+    private DummyBlimpClientContext(long nativeDummyBlimpClientContextAndroid) {
+        mNativeDummyBlimpClientContextAndroid = nativeDummyBlimpClientContextAndroid;
+    }
+
+    @Override
+    public BlimpContents createBlimpContents() {
+        return null;
+    }
+
+    @CalledByNative
+    private void clearNativePtr() {
+        mNativeDummyBlimpClientContextAndroid = 0;
+    }
+
+    @CalledByNative
+    private long getNativePtr() {
+        assert mNativeDummyBlimpClientContextAndroid != 0;
+        return mNativeDummyBlimpClientContextAndroid;
+    }
+}