Add Check and DCheck java classes to base

base/android/java/src/org/chromium/base/ThreadUtils.java

Index: base/android/java/src/org/chromium/base/ThreadUtils.java
diff --git a/base/android/java/src/org/chromium/base/ThreadUtils.java b/base/android/java/src/org/chromium/base/ThreadUtils.java
index ef2887acd0c97e5c8ca97beb489c1dbe50302d98..9c557e806b4403135a08ec3f41817f3f9161cf94 100644
--- a/base/android/java/src/org/chromium/base/ThreadUtils.java
+++ b/base/android/java/src/org/chromium/base/ThreadUtils.java
@@ -35,9 +35,9 @@ public class ThreadUtils {
     public static void setUiThread(Looper looper) {
         synchronized (sLock) {
             if (sUiThreadHandler != null && sUiThreadHandler.getLooper() != looper) {
-                throw new RuntimeException("UI thread looper is already set to "
-                        + sUiThreadHandler.getLooper() + " (Main thread looper is "
-                        + Looper.getMainLooper() + "), cannot set to new looper " + looper);
+                Check.notReached("UI thread looper is already set to %1$s (Main thread looper is "
+                               + "%2$s), cannot set to new looper %3$s",
+                        sUiThreadHandler.getLooper(), Looper.getMainLooper(), looper);
             } else {
                 sUiThreadHandler = new Handler(looper);
             }
@@ -47,9 +47,7 @@ public class ThreadUtils {
     private static Handler getUiThreadHandler() {
         synchronized (sLock) {
             if (sUiThreadHandler == null) {
-                if (sWillOverride) {
-                    throw new RuntimeException("Did not yet override the UI thread");
-                }
+                Check.isFalse(sWillOverride, "Did not yet override the UI thread");
                 sUiThreadHandler = new Handler(Looper.getMainLooper());
             }
             return sUiThreadHandler;