[android log] add convenience functions and improve tag headspace

base/android/junit/src/org/chromium/base/LogTest.java

Index: base/android/junit/src/org/chromium/base/LogTest.java
diff --git a/base/android/junit/src/org/chromium/base/LogTest.java b/base/android/junit/src/org/chromium/base/LogTest.java
index 14726fe254a00ca1e8b52264d8cf260223083776..46bdc67e62dcf970b8b03f97ffb25a90491257ac 100644
--- a/base/android/junit/src/org/chromium/base/LogTest.java
+++ b/base/android/junit/src/org/chromium/base/LogTest.java
@@ -25,9 +25,15 @@
     /** Test method for {@link Log#makeTag(String)} */
     @Test
     public void testMakeTag() {
-        assertEquals("chromium.Foo", Log.makeTag("Foo"));
-        assertEquals("chromium", Log.makeTag(null));
-        assertEquals("chromium", Log.makeTag(""));
+        assertEquals("cr.Foo", Log.makeTag("Foo"));
+        assertEquals("cr", Log.makeTag(null));
+        assertEquals("cr", Log.makeTag(""));
+    }
+
+    /** Test method for {@link Log#makeTag(String)} */
+    @Test(expected = IllegalArgumentException.class)
+    public void testMakeTagFailure() {
+        Log.makeTag("ThisIs21Char.....Long");
     }
 
     /** Tests that the computed call origin is the correct one. */