WebView Metrics client implementation (Chromium part)

BUG=546754

Review URL: https://codereview.chromium.org/1474483004

Cr-Commit-Position: refs/heads/master@{#367433}

3 files changed, 88 insertions, 0 deletions

diff --git a/android_webview/java/src/org/chromium/android_webview/AwBrowserContext.java b/android_webview/java/src/org/chromium/android_webview/AwBrowserContext.java
index ea5a637..3d62926 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwBrowserContext.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwBrowserContext.java
@@ -26,9 +26,11 @@ public class AwBrowserContext {
     private AwFormDatabase mFormDatabase;
     private HttpAuthDatabase mHttpAuthDatabase;
     private AwMessagePortService mMessagePortService;
+    private AwMetricsServiceClient mMetricsServiceClient;
 
     public AwBrowserContext(SharedPreferences sharedPreferences, Context applicationContext) {
         mSharedPreferences = sharedPreferences;
+        mMetricsServiceClient = new AwMetricsServiceClient(applicationContext);
     }
 
     public AwGeolocationPermissions getGeolocationPermissions() {
@@ -59,6 +61,10 @@ public class AwBrowserContext {
         return mMessagePortService;
     }
 
+    public AwMetricsServiceClient getMetricsServiceClient() {
+        return mMetricsServiceClient;
+    }
+
     /**
      * @see android.webkit.WebView#pauseTimers()
      */
diff --git a/android_webview/java/src/org/chromium/android_webview/AwMetricsServiceClient.java b/android_webview/java/src/org/chromium/android_webview/AwMetricsServiceClient.java
new file mode 100644
index 0000000..7775fb2
--- /dev/null
+++ b/android_webview/java/src/org/chromium/android_webview/AwMetricsServiceClient.java
@@ -0,0 +1,29 @@
+// 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.annotations.JNINamespace;
+
+/**
+ * Java twin of the homonymous C++ class. The Java side is only responsible for
+ * switching metrics on and off. Since the setting is a platform feature, it
+ * must be obtained through PlatformServiceBridge.
+ */
+@JNINamespace("android_webview")
+public class AwMetricsServiceClient {
+    public AwMetricsServiceClient(Context applicationContext) {
+        PlatformServiceBridge.getInstance(applicationContext)
+                .setMetricsSettingListener(new ValueCallback<Boolean>() {
+                    public void onReceiveValue(Boolean enabled) {
+                        nativeSetMetricsEnabled(enabled);
+                    }
+                });
+    }
+
+    public static native void nativeSetMetricsEnabled(boolean enabled);
+}
diff --git a/android_webview/java/src/org/chromium/android_webview/PlatformServiceBridge.java b/android_webview/java/src/org/chromium/android_webview/PlatformServiceBridge.java
new file mode 100644
index 0000000..4051c23
--- /dev/null
+++ b/android_webview/java/src/org/chromium/android_webview/PlatformServiceBridge.java
@@ -0,0 +1,53 @@
+// 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
+ * 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) {}
+}