arc: Add settings bridge

Synchronize font and spoken feedback enabled settings from Chrome to
Android on Android start and keep settings in sync by listening for
Chrome preference changes.

Related changes:
* ag/822770
* ag/822726

BUG=561003
TEST=./unit_tests --gtest_filter='Arc*'
TEST=Build both sides. Change font size in chrome://settings or enable
     spoken feedback (Ctrl+Alt+Z). Observe change in Android.

Review URL: https://codereview.chromium.org/1539633002

Cr-Commit-Position: refs/heads/master@{#366145}

1 files changed, 53 insertions, 0 deletions

diff --git a/chrome/browser/chromeos/arc/arc_settings_bridge_unittest.cc b/chrome/browser/chromeos/arc/arc_settings_bridge_unittest.cc
new file mode 100644
index 0000000..864f016
--- /dev/null
+++ b/chrome/browser/chromeos/arc/arc_settings_bridge_unittest.cc
@@ -0,0 +1,53 @@
+// Copyright (c) 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.
+
+#include "chrome/browser/chromeos/arc/arc_settings_bridge_impl.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace arc {
+
+namespace fontsizes {
+
+TEST(ArcSettingsBridgeTest, FontSizeConvertChromeToAndroid) {
+  // Does not return a value smaller than Small.
+  EXPECT_DOUBLE_EQ(kAndroidFontScaleSmall,
+                   ConvertFontSizeChromeToAndroid(0, 0, 0));
+
+  // Does not return a value larger than Huge
+  EXPECT_DOUBLE_EQ(kAndroidFontScaleHuge,
+                   ConvertFontSizeChromeToAndroid(100, 100, 100));
+
+  // The max of any Chrome values is what determines the Android value.
+  EXPECT_DOUBLE_EQ(kAndroidFontScaleLarge,
+                   ConvertFontSizeChromeToAndroid(20, 0, 0));
+  EXPECT_DOUBLE_EQ(kAndroidFontScaleLarge,
+                   ConvertFontSizeChromeToAndroid(0, 20, 0));
+  EXPECT_DOUBLE_EQ(kAndroidFontScaleLarge,
+                   ConvertFontSizeChromeToAndroid(0, 0, 20));
+
+  // default fixed font size is adjusted up three pixels
+  EXPECT_DOUBLE_EQ(kAndroidFontScaleLarge,
+                   ConvertFontSizeChromeToAndroid(0, 17, 0));
+
+  // Small converts properly.
+  EXPECT_DOUBLE_EQ(kAndroidFontScaleSmall,
+                   ConvertFontSizeChromeToAndroid(12, 0, 0));
+
+  // Normal converts properly.
+  EXPECT_DOUBLE_EQ(kAndroidFontScaleNormal,
+                   ConvertFontSizeChromeToAndroid(16, 0, 0));
+
+  // Large converts properly.
+  EXPECT_DOUBLE_EQ(kAndroidFontScaleLarge,
+                   ConvertFontSizeChromeToAndroid(20, 0, 0));
+
+  // Very large converts properly.
+  EXPECT_DOUBLE_EQ(kAndroidFontScaleHuge,
+                   ConvertFontSizeChromeToAndroid(24, 0, 0));
+}
+
+}  // namespace fontsizes
+
+}  // namespace arc