Add BlimpClientContext and factory with real and dummy implementation

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

+// 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.base.annotations.JNINamespace;
+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.
+ */
+@JNINamespace("chrome")
+public class ChromeBlimpClientContextDelegate {
+    public static ChromeBlimpClientContextDelegate createAndSetDelegateForContext(Profile profile) {

[David Trainor- moved to gerrit, 2016/07/14 19:07:13]

Javadoc?  Explain a bit taht only one of these can be bound to the context at
the same time?  Should this also take in a BlimpClientContext instead of a
Profile?  Maybe to make it more explicit?

[nyquist, 2016/07/14 22:56:50]

Yeah, that'd be cool, but the constructor of the C++ version of the
ChromeBlimpClientContextDelegate needs the Profile, since it needs it to attach
the Profile to new BlimpContents. I /could/ pass both, but since the BCC can be
retrieved from the Profile, that feels weird too.

Anyway, I've of course added documentation for this method.

+        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);
+}