Update from https://crrev.com/327068

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
new file mode 100644
index 0000000000000000000000000000000000000000..14726fe254a00ca1e8b52264d8cf260223083776
--- /dev/null
+++ b/base/android/junit/src/org/chromium/base/LogTest.java
@@ -0,0 +1,93 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.base;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+import org.chromium.testing.local.LocalRobolectricTestRunner;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.annotation.Config;
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.shadows.ShadowLog;
+
+import java.util.List;
+
+/** Unit tests for {@link Log}. */
+@RunWith(LocalRobolectricTestRunner.class)
+@Config(manifest = Config.NONE, shadows = {LogTest.PermissiveShadowLog.class})
+public class LogTest {
+    /** 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(""));
+    }
+
+    /** Tests that the computed call origin is the correct one. */
+    @Test
+    public void callOriginTest() {
+        Log.d("Foo", "Bar");
+
+        List<ShadowLog.LogItem> logs = ShadowLog.getLogs();
+        assertEquals("Only one log should be written", 1, logs.size());
+
+        assertTrue("The origin of the log message (" + logs.get(0).msg + ") looks wrong.",
+                logs.get(0).msg.matches("\\[LogTest.java:\\d+\\].*"));
+    }
+
+    /** Tests that exceptions provided to the log functions are properly recognized and printed. */
+    @Test
+    public void exceptionLoggingTest() {
+        Throwable t = new Throwable() {
+            @Override
+            public String toString() {
+                return "MyThrowable";
+            }
+        };
+
+        Throwable t2 = new Throwable() {
+            @Override
+            public String toString() {
+                return "MyOtherThrowable";
+            }
+        };
+
+        List<ShadowLog.LogItem> logs = ShadowLog.getLogs();
+
+        // The throwable gets printed out
+        Log.i("Foo", "Bar", t);
+        assertEquals(t, logs.get(logs.size() - 1).throwable);
+        assertEquals("Bar", logs.get(logs.size() - 1).msg);
+
+        // The throwable can be both added to the message itself and printed out
+        Log.i("Foo", "Bar %s", t);
+        assertEquals(t, logs.get(logs.size() - 1).throwable);
+        assertEquals("Bar MyThrowable", logs.get(logs.size() - 1).msg);
+
+        // Non throwable are properly identified
+        Log.i("Foo", "Bar %s", t, "Baz");
+        assertNull(logs.get(logs.size() - 1).throwable);
+        assertEquals("Bar MyThrowable", logs.get(logs.size() - 1).msg);
+
+        // The last throwable is the one used that is going to be printed out
+        Log.i("Foo", "Bar %s %s", t, t2);
+        assertEquals(t2, logs.get(logs.size() - 1).throwable);
+        assertEquals("Bar MyThrowable MyOtherThrowable", logs.get(logs.size() - 1).msg);
+    }
+
+    /** Needed to allow debug/verbose logging that is disabled by default. */
+    @Implements(android.util.Log.class)
+    public static class PermissiveShadowLog extends ShadowLog {
+        @Implementation
+        public static boolean isLoggable(String tag, int level) {
+            return true;
+        }
+    }
+}