WebView Metrics client implementation (Chromium part)

android_webview/java/src/org/chromium/android_webview/PlatformServiceBridge.java

+// 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.android_webview;
+
+import android.content.Context;
+import android.webkit.ValueCallback;
+
+import org.chromium.base.Log;
+
+import java.lang.reflect.InvocationTargetException;
+
+/**
+ * This class manages platform-specific services. (i.e. Google Services) The platform

[sgurun-gerrit only, 2015/12/21 21:47:26]

It is actually the Google Webview implementation that should extend this class,
not the platform. please reword.

[paulmiller, 2015/12/22 19:42:04]

Google WebView is part of the "platform". Since this is the non-Google-specific
part of the code, I worded it to be non-Google-specific.

[sgurun-gerrit only, 2015/12/23 00:08:55]

Himm, Webview is part of the frameworks actually. But I think thinking about it,
the platform specific implementation of webview needs to overwrite this if it
wants to, so yeah I can live with it :)

+ * should extend this class and use this base class to fetch their specialized version.
+ */
+public class PlatformServiceBridge {
+    private static final String TAG = "PlatformServiceBrid-";
+    private static final String PLATFORM_SERVICE_BRIDGE =
+            "com.android.webview.chromium.PlatformServiceBridgeGoogle";
+
+    private static PlatformServiceBridge sInstance;
+
+    protected PlatformServiceBridge() {}
+
+    public static PlatformServiceBridge getInstance(Context applicationContext) {
+        if (sInstance != null) {
+            return sInstance;
+        }
+
+        // Try to get a specialized service bridge.
+        try {
+            Class<?> cls = Class.forName(PLATFORM_SERVICE_BRIDGE);
+            sInstance = (PlatformServiceBridge) cls.getDeclaredConstructor(Context.class)
+                    .newInstance(applicationContext);
+            return sInstance;
+        } catch (ClassNotFoundException e) {
+            // This is not an error; it just means this device doesn't have specialized services.
+        } catch (IllegalAccessException | IllegalArgumentException | InstantiationException
+                | NoSuchMethodException e) {
+            Log.e(TAG, "Failed to get " + PLATFORM_SERVICE_BRIDGE + ": " + e);
+        } catch (InvocationTargetException e) {
+            Log.e(TAG, "Failed invocation to get " + PLATFORM_SERVICE_BRIDGE + ":",
+                    e.getCause());
+        }
+
+        // Otherwise, get the generic service bridge.
+        sInstance = new PlatformServiceBridge();
+        return sInstance;
+    }
+
+    public void setMetricsSettingListener(ValueCallback<Boolean> callback) {}
+}