Bug 1191083 - Implement more GeckoThread states; r=snorp

Implement the MOZGLUE_READY and JNI_READY states in GeckoThread. Also
change GeckoJavaSampler to use the new states instead of a separate
flag.

mobile/android/base/GeckoJavaSampler.java

@@ -19,7 +19,6 @@ public class GeckoJavaSampler {
     private static Thread sSamplingThread;
     private static SamplingThread sSamplingRunnable;
     private static Thread sMainThread;
-    private static volatile boolean sLibsLoaded;
 
     // Use the same timer primitive as the profiler
     // to get a perfect sample syncing.
@@ -31,7 +30,7 @@ public class GeckoJavaSampler {
         public long mJavaTime; // non-zero if Android system time is used
         public Sample(StackTraceElement[] aStack) {
             mFrames = new Frame[aStack.length];
-            if (sLibsLoaded) {
+            if (GeckoThread.isStateAtLeast(GeckoThread.State.LIBS_READY)) {
                 mTime = getProfilerTime();
             }
             if (mTime == 0.0d) {
@@ -208,10 +207,6 @@ public class GeckoJavaSampler {
             sSamplingRunnable = null;
         }
     }
-
-    public static void setLibsLoaded() {
-        sLibsLoaded = true;
-    }
 }