Added implementation of Android platform module.

python/android/python/AndroidPlatform.java

@@ -1,10 +1,13 @@
 package python;
 
+import android.os.Debug;
+
+
 class AndroidPlatform implements python.PythonPlatform {
     public AndroidPlatform() {}
 
     public long clock() {
-        throw new org.python.exceptions.NotImplementedError("Android platform not implemented yet");
+        return Debug.threadCpuTimeNanos();
     }
 
 }

python/common/python/PythonPlatform.java

@@ -1,6 +1,9 @@
 package python;
 
 interface PythonPlatform {
+    /**
+     * Return the number of CPU nanoseconds that this thread has consumed.
+     */
     public long clock();
 
 }

python/oracle/python/OraclePlatform.java

@@ -1,10 +1,14 @@
 package python;
 
+import java.lang.management.ManagementFactory;
+import java.lang.management.ThreadMXBean;
+
+
 class OraclePlatform implements python.PythonPlatform {
     public OraclePlatform() {}
 
     public long clock() {
-        java.lang.management.ThreadMXBean tmxb = java.lang.management.ManagementFactory.getThreadMXBean();
+        ThreadMXBean tmxb = ManagementFactory.getThreadMXBean();
         return tmxb.getCurrentThreadCpuTime();
     }