Additions to support crazy linker callbacks from the UI thread.

base/android/java/src/org/chromium/base/library_loader/Linker.java

Index: base/android/java/src/org/chromium/base/library_loader/Linker.java
diff --git a/base/android/java/src/org/chromium/base/library_loader/Linker.java b/base/android/java/src/org/chromium/base/library_loader/Linker.java
index e17ba6dc0de61b91f8978e22587fbce3cd7fd5c9..54a672d7f166e9b625b736beef5ec6ae0ade6bdf 100644
--- a/base/android/java/src/org/chromium/base/library_loader/Linker.java
+++ b/base/android/java/src/org/chromium/base/library_loader/Linker.java
@@ -11,6 +11,7 @@ import android.os.Parcelable;
 import android.util.Log;
 
 import org.chromium.base.SysUtils;
+import org.chromium.base.ThreadUtils;
 
 import java.io.File;
 import java.io.FileInputStream;
@@ -842,6 +843,29 @@ public class Linker {
     }
 
     /**
+     * Move activity from the native thread to the main UI thread.
+     * Called from native code on its own thread.  Posts a callback from
+     * the UI thread back to native code.
+     *
+     * @param opaque Opaque argument.
+     */
+    public static void postCallbackOnMainThread(final long opaque) {
+        ThreadUtils.postOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                nativeRunCallbackOnUiThread(opaque);
+            }
+        });
+    }
+
+    /**
+     * Native method to run callbacks on the main UI thread.
+     * Supplied by the crazy linker and called by postCallbackOnMainThread.
+     * @param opaque Opaque crazy linker arguments.
+     */
+    private static native void nativeRunCallbackOnUiThread(long opaque);
+
+    /**
      * Native method used to load a library.
      * @param library Platform specific library name (e.g. libfoo.so)
      * @param loadAddress Explicit load address, or 0 for randomized one.