Upstream changes for NetworkQualityProvider

chrome/android/java/src/org/chromium/chrome/browser/net/qualityprovider/NetworkQualityProviderHelper.java

Index: chrome/android/java/src/org/chromium/chrome/browser/net/qualityprovider/NetworkQualityProviderHelper.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/net/qualityprovider/NetworkQualityProviderHelper.java b/chrome/android/java/src/org/chromium/chrome/browser/net/qualityprovider/NetworkQualityProviderHelper.java
new file mode 100644
index 0000000000000000000000000000000000000000..824c4722f2128873b53803ecba07d8fb6ad7dd08
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/net/qualityprovider/NetworkQualityProviderHelper.java
@@ -0,0 +1,92 @@
+// 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.chrome.browser.net.qualityprovider;
+
+import android.content.Context;
+
+import org.chromium.base.CalledByNative;
+import org.chromium.chrome.browser.ChromeApplication;
+import org.chromium.chrome.browser.util.NonThreadSafe;
+
+/**
+ * This class is responsible for helping the native code communicate with the APIs provided by
+ * the operating system through NetworkQualityProvider.
+ */
+public class NetworkQualityProviderHelper {
+    private static Context sContext = null;
+    private static NonThreadSafe sThreadCheck = null;
+
+    private NetworkQualityProviderHelper() {}
+
+    @CalledByNative
+    private static NetworkQualityProviderHelper create(Context context) {
+        assert sThreadCheck == null;
+        assert sContext == null;
+        assert context != null;
+        sThreadCheck = new NonThreadSafe();
+        sContext = context;
+        return new NetworkQualityProviderHelper();
+    }
+
+    @CalledByNative
+    private static boolean isEstimateAvailable() {
+        assert sThreadCheck.calledOnValidThread();
+        if (sContext == null) return false;

[bengr, 2015/07/21 00:06:48]

Braces, on every if statement.

[tbansal1, 2015/07/21 16:18:25]

Please see the reply on the other file.

+
+        final NetworkQualityProvider networkQualityProvider =
+                ((ChromeApplication) sContext).getNetworkQualityProvider();
+        return networkQualityProvider.isEstimateAvailable();
+    }
+
+    @CalledByNative
+    private static int getRTTMilliseconds() {
+        assert sThreadCheck.calledOnValidThread();
+        if (sContext == null) return 0;
+
+        final NetworkQualityProvider networkQualityProvider =
+                ((ChromeApplication) sContext).getNetworkQualityProvider();
+        return networkQualityProvider.getRTTMilliseconds();
+    }
+
+    @CalledByNative
+    private static int getDownstreamThroughputKbps() {
+        assert sThreadCheck.calledOnValidThread();
+        if (sContext == null) return 0;
+
+        final NetworkQualityProvider networkQualityProvider =
+                ((ChromeApplication) sContext).getNetworkQualityProvider();
+        return convertLongToInt(networkQualityProvider.getDownstreamThroughputKbps());
+    }
+
+    @CalledByNative
+    private static int getUpstreamThroughputKbps() {
+        assert sThreadCheck.calledOnValidThread();
+        if (sContext == null) return 0;
+
+        final NetworkQualityProvider networkQualityProvider =
+                ((ChromeApplication) sContext).getNetworkQualityProvider();
+        return convertLongToInt(networkQualityProvider.getUpstreamThroughputKbps());
+    }
+
+    @CalledByNative
+    private static int getTimeSinceLastUpdateSeconds() {
+        assert sThreadCheck.calledOnValidThread();
+        if (sContext == null) return 0;
+
+        final NetworkQualityProvider networkQualityProvider =
+                ((ChromeApplication) sContext).getNetworkQualityProvider();
+        return convertLongToInt(networkQualityProvider.getTimeSinceLastUpdateSeconds());
+    }
+
+    private static int convertLongToInt(long value) {
+        if (value > Integer.MAX_VALUE) {
+            return Integer.MAX_VALUE;
+        }
+        if (value < Integer.MIN_VALUE) {
+            return Integer.MIN_VALUE;
+        }
+        return (int) value;
+    }
+}