Add BlimpClientContext and factory with real and dummy implementation

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

Index: chrome/android/java/src/org/chromium/chrome/browser/blimp/ChromeBlimpClientContextDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/blimp/ChromeBlimpClientContextDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/blimp/ChromeBlimpClientContextDelegate.java
new file mode 100644
index 0000000000000000000000000000000000000000..d01e1fb108e1ea64b378bcff755e394692c44991
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/blimp/ChromeBlimpClientContextDelegate.java
@@ -0,0 +1,56 @@
+// 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.base.annotations.CalledByNative;
+import org.chromium.chrome.browser.profiles.Profile;
+
+/**
+ * The ChromeBlimpClientContextDelegate for //chrome which provides the necessary functionality
+ * required to run Blimp. This is the Java counterparty to the C++
+ * ChromeBlimpClientContextDelegateAndroid.
+ *
+ * There can only be a single delegate for any given BlimpClientContext. To create one and attach
+ * it, call {@link ChromeBlimpClientContextDelegate#createAndSetDelegateForContext(Profile)}.
+ * When the delegate should be deleted, a call to {@link #destroy} is required.
+ */
+public class ChromeBlimpClientContextDelegate {
+    /**
+     * Creates a new ChromeBlimpClientContextDelegate that is owned by the caller. It automatically
+     * attaches itself as the sole delegate for the BlimpClientContext attached to the given
+     * profile. When the delegate should be deleted, the caller of this method must call
+     * {@link #destroy()} to ensure that the native counterparts are cleaned up. The call to
+     * {@link #destroy()} also removes the delegate from the BlimpClientContext by clearing the
+     * pointer for the delegate by calling BlimpClientContext::SetDelegate(nullptr).
+     *
+     * @param profile The profile to use to look for the BlimpClientContext.
+     * @return The newly created delegate, owned by the caller.
+     */
+    public static ChromeBlimpClientContextDelegate createAndSetDelegateForContext(Profile profile) {
+        return new ChromeBlimpClientContextDelegate(profile);
+    }
+
+    /**
+     * The pointer to the ChromeBlimpClientContextDelegateAndroid JNI bridge.
+     */
+    private long mNativeChromeBlimpClientContextDelegateAndroid;
+
+    private ChromeBlimpClientContextDelegate(Profile profile) {
+        mNativeChromeBlimpClientContextDelegateAndroid = nativeInit(profile);
+    }
+
+    @CalledByNative
+    private void clearNativePtr() {
+        mNativeChromeBlimpClientContextDelegateAndroid = 0;
+    }
+
+    public void destroy() {
+        assert mNativeChromeBlimpClientContextDelegateAndroid != 0;
+        nativeDestroy(mNativeChromeBlimpClientContextDelegateAndroid);
+    }
+
+    private native long nativeInit(Profile profile);
+    private native void nativeDestroy(long nativeChromeBlimpClientContextDelegateAndroid);
+}