Add BlimpClientContext and factory with real and dummy implementation

chrome/android/java/src/org/chromium/chrome/browser/blimp/BlimpClientContextFactory.java

Index: chrome/android/java/src/org/chromium/chrome/browser/blimp/BlimpClientContextFactory.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/blimp/BlimpClientContextFactory.java b/chrome/android/java/src/org/chromium/chrome/browser/blimp/BlimpClientContextFactory.java
new file mode 100644
index 0000000000000000000000000000000000000000..c5459309510c39ea814cff14dce927910f5b34b4
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/blimp/BlimpClientContextFactory.java
@@ -0,0 +1,29 @@
+// 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.chrome.browser.blimp;
+
+import org.chromium.blimp_public.BlimpClientContext;
+import org.chromium.chrome.browser.profiles.Profile;
+
+/**
+ * This factory creates BlimpClientContexts for the given {@link Profile}.
+ */
+public final class BlimpClientContextFactory {
+    // Don't instantiate me.
+    private BlimpClientContextFactory() {}
+
+    /**
+     * A factory method to build a {@link BlimpClientContext} object. Each Profile only ever has
+     * a single {@link BlimpClientContext}, so the first this method is called (or from native),
+     * the {@link BlimpClientContext} will be created, and later calls will return the already
+     * created instance.
+     * @return The {@link BlimpClientContext} for the given profile object.
+     */
+    public static BlimpClientContext getBlimpClientContextForProfile(Profile profile) {
+        return nativeGetBlimpClientContextForProfile(profile);
+    }
+
+    private static native BlimpClientContext nativeGetBlimpClientContextForProfile(Profile profile);
+}