Introduce @CalledByReflection annotation.

BUG=163393

Review URL: https://codereview.chromium.org/509753002

Cr-Commit-Position: refs/heads/master@{#292394}

components/cronet/android/java/src/org/chromium/net/UsedByReflection.java → base/android/java/src/org/chromium/base/UsedByReflection.java

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-package org.chromium.net;
+package org.chromium.base;
 
 import java.lang.annotation.ElementType;
 import java.lang.annotation.Target;

components/cronet/android/java/src/org/chromium/net/ChromiumUrlRequestFactory.java

@@ -7,6 +7,8 @@ package org.chromium.net;
 import android.content.Context;
 import android.os.Build;
 
+import org.chromium.base.UsedByReflection;
+
 import java.nio.channels.WritableByteChannel;
 import java.util.Map;
 

content/public/android/java/src/org/chromium/content/browser/SmartClipProvider.java

@@ -6,6 +6,8 @@ package org.chromium.content.browser;
 
 import android.os.Handler;
 
+import org.chromium.base.UsedByReflection;
+
 /**
  * An interface to provide smart clip data when requested.
  *
@@ -13,15 +15,18 @@ import android.os.Handler;
  * Please make sure implementation of them is somewhere in the view
  * hierarchy.
  */
+@UsedByReflection("ExternalOemSupport")
 public interface SmartClipProvider {
     /**
      * Initiate extraction of text, HTML, and other information for clipping puposes (smart clip)
      * from the rectangle area defined by starting positions (x and y), and width and height.
      */
+    @UsedByReflection("ExternalOemSupport")
     void extractSmartClipData(int x, int y, int width, int height);
 
     /**
      * Register a handler to handle smart clip data once extraction is done.
      */
+    @UsedByReflection("ExternalOemSupport")
     void setSmartClipResultHandler(final Handler resultHandler);
 }