[Android] Add meta-data to point to implementations of SmartClipProvider

chrome/android/javatests/src/org/chromium/chrome/browser/SmartClipProviderTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/SmartClipProviderTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/ContentViewTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/SmartClipProviderTest.java
similarity index 52%
rename from chrome/android/javatests/src/org/chromium/chrome/browser/ContentViewTest.java
rename to chrome/android/javatests/src/org/chromium/chrome/browser/SmartClipProviderTest.java
index abfb6524e92efb28c7a469c4ceec5464c597f6d4..c9a3bde05f7034771bf50067c9aa8bb4990da7b2 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/ContentViewTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/SmartClipProviderTest.java
@@ -4,26 +4,36 @@
 
 package org.chromium.chrome.browser;
 
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageManager;
 import android.graphics.Rect;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Message;
 import android.test.suitebuilder.annotation.MediumTest;
+import android.view.View;
+import android.view.ViewGroup;
 
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.test.util.Feature;
 import org.chromium.chrome.shell.ChromeShellActivity;
 import org.chromium.chrome.shell.ChromeShellTestBase;
-import org.chromium.content.browser.ContentView;
+import org.chromium.chrome.shell.R;
 import org.chromium.content.browser.test.util.CallbackHelper;
 
+import java.lang.reflect.Method;
 import java.util.concurrent.TimeoutException;
 
 /**
- * Tests for the ContentView.
+ * Tests for the SmartClipProvider.
  */
-public class ContentViewTest extends ChromeShellTestBase implements Handler.Callback {
+public class SmartClipProviderTest extends ChromeShellTestBase implements Handler.Callback {
+    // This is a key for meta-data in the package manifest. It should NOT
+    // change, as OEMs will use it when they look for the SmartClipProvider
+    // interface.
+    private static final String SMART_CLIP_PROVIDER_KEY =
+            "org.chromium.content.browser.SMART_CLIP_PROVIDER";
 
     private static class MyCallbackHelper extends CallbackHelper {
         public String getTitle() {
@@ -66,6 +76,9 @@ public class ContentViewTest extends ChromeShellTestBase implements Handler.Call
     private MyCallbackHelper mCallbackHelper;
     private HandlerThread mHandlerThread;
     private Handler mHandler;
+    private Class<?> mSmartClipProviderClass;
+    private Method mSetSmartClipResultHandlerMethod;
+    private Method mExtractSmartClipDataMethod;
 
     @Override
     public void setUp() throws Exception {
@@ -75,6 +88,14 @@ public class ContentViewTest extends ChromeShellTestBase implements Handler.Call
         mHandlerThread = new HandlerThread("ContentViewTest thread");
         mHandlerThread.start();
         mHandler = new Handler(mHandlerThread.getLooper(), this);
+
+        mSmartClipProviderClass = getSmartClipProviderClass();
+        assertNotNull(mSmartClipProviderClass);
+        mSetSmartClipResultHandlerMethod = mSmartClipProviderClass.getDeclaredMethod(
+                "setSmartClipResultHandler", new Class[] { Handler.class });
+        mExtractSmartClipDataMethod = mSmartClipProviderClass.getDeclaredMethod(
+                "extractSmartClipData",
+                new Class[] { Integer.TYPE, Integer.TYPE, Integer.TYPE, Integer.TYPE });
     }
 
     @Override
@@ -101,16 +122,54 @@ public class ContentViewTest extends ChromeShellTestBase implements Handler.Call
         return true;
     }
 
+    // Create SmartClipProvider interface from package meta-data.
+    private Class<?> getSmartClipProviderClass() throws Exception {
+        ApplicationInfo ai = mActivity.getPackageManager().getApplicationInfo(
+                mActivity.getPackageName(), PackageManager.GET_META_DATA);
+        Bundle bundle = ai.metaData;
+        String className = bundle.getString(SMART_CLIP_PROVIDER_KEY);
+        assertNotNull(className);
+        return Class.forName(className);
+    }
+
+    // Returns the first smart clip provider under the root view using DFS.
+    private Object findSmartClipProvider(View v) {
+        if (mSmartClipProviderClass.isInstance(v)) {
+            return v;
+        } else if (v instanceof ViewGroup) {
+            ViewGroup viewGroup = (ViewGroup) v;
+            int count = viewGroup.getChildCount();
+            for (int i = 0; i < count; ++i) {
+                View c = viewGroup.getChildAt(i);
+                Object found = findSmartClipProvider(c);
+                if (found != null)
+                    return found;
+            }
+        }
+        return null;
+    }
+
     @MediumTest
     @Feature({"SmartClip"})
     public void testSmartClipDataCallback() throws InterruptedException, TimeoutException {
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override
             public void run() {
-                ContentView cv = (ContentView) getActivity().getActiveTab().getView();
-                assertNotNull(cv);
-                cv.setSmartClipResultHandler(mHandler);
-                cv.extractSmartClipData(10, 20, 100, 70);
+                // This emulates what OEM will be doing when they want to call
+                // functions on SmartClipProvider through view hierarchy.
+
+                // Implementation of SmartClipProvider such as ContentView or
+                // JellyBeanContentView can be found somewhere under content_container.
+                Object scp = findSmartClipProvider(
+                        getActivity().findViewById(R.id.content_container));
+                assertNotNull(scp);
+                try {
+                    mSetSmartClipResultHandlerMethod.invoke(scp, mHandler);
+                    mExtractSmartClipDataMethod.invoke(scp, 10, 20, 100, 70);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                    fail();
+                }
             }
         });
         mCallbackHelper.waitForCallback(0, 1);  // call count: 0 --> 1