Build mojo_shell on Android

mojo/shell/android/shell_apk/src/org/chromium/mojo_shell_apk/LibraryLoader.java

Index: mojo/shell/android/shell_apk/src/org/chromium/mojo_shell_apk/LibraryLoader.java
diff --git a/mojo/shell/android/shell_apk/src/org/chromium/mojo_shell_apk/LibraryLoader.java b/mojo/shell/android/shell_apk/src/org/chromium/mojo_shell_apk/LibraryLoader.java
new file mode 100644
index 0000000000000000000000000000000000000000..777c1c7e6efc239cc000a8165cc425c6cb6a29b1
--- /dev/null
+++ b/mojo/shell/android/shell_apk/src/org/chromium/mojo_shell_apk/LibraryLoader.java
@@ -0,0 +1,20 @@
+// Copyright 2013 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.mojo_shell_apk;
+
+import java.lang.UnsatisfiedLinkError;
+import org.chromium.base.JNINamespace;
+
+@JNINamespace("mojo")
+public class LibraryLoader {
+    private static Boolean sInitialized = false;
+
+    public static void ensureInitialized() throws UnsatisfiedLinkError {
+        if (!sInitialized)
+            return;
+        sInitialized = true;
+        System.loadLibrary("mojo_shell");

[joth, 2013/10/24 04:37:57]

Probably not a blocker at this point, but assuming you want to use command line,
JNI calls, etc I expect you'll want to use
org/chromium/content/app/LibraryLoader.java for this in future, implying that'll
need factoring out to a lower layer.

[bulach, 2013/10/24 12:58:04]

plus all the threading issues :)

just FYI, things to keep in mind for mojo:
- the library is normally loaded in a background thread
---- except for things that require synchronous initialization, like "android
content providers"
- main thread in java does all the java-UI initialization
- notification comes back to the main thread, initialization proceeds
- recently, the monolithic "main()" was split in multiple smaller tasks so that
the java UI is never blocked on those.

[abarth-chromium, 2013/10/24 13:43:05]

Yes.  We've been avoiding introducing a dependency from Content to Mojo, but we
should either add that dependency or move this sort of class to a lower layer.

[abarth-chromium, 2013/10/24 13:43:05]

Thanks, that's very useful information.  At this stage, we'll trying to get
something basic running.  We'll likely need to work through those sorts of
issues once we get the basics up and running.

+    }
+}