WebView: Create UMA uploader

android_webview/java/src/org/chromium/android_webview/AwMetricsLogUploader.java

Index: android_webview/java/src/org/chromium/android_webview/AwMetricsLogUploader.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwMetricsLogUploader.java b/android_webview/java/src/org/chromium/android_webview/AwMetricsLogUploader.java
new file mode 100644
index 0000000000000000000000000000000000000000..09e0b42750c80da05510fb76c78bc5c95e3c6e21
--- /dev/null
+++ b/android_webview/java/src/org/chromium/android_webview/AwMetricsLogUploader.java
@@ -0,0 +1,21 @@
+// Copyright 2017 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 org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+
+/**
+ * Passes UMA logs from native to PlatformServiceBridge.
+ */
+@JNINamespace("android_webview")
+public class AwMetricsLogUploader {
+    @CalledByNative
+    public static void uploadLog(byte[] data) {
+        // getInstance only needs a Context on the first call. WebViewChromiumFactoryProvider will
+        // have already called it, so we can pass null here.
+        PlatformServiceBridge.getInstance(null).logMetrics(data);
+    }
+}