[ios] Adds test provider implementations.

ios/public/provider/chrome/browser/sessions/test_live_tab_context_provider.h

Index: ios/public/provider/chrome/browser/sessions/test_live_tab_context_provider.h
diff --git a/ios/public/provider/chrome/browser/sessions/test_live_tab_context_provider.h b/ios/public/provider/chrome/browser/sessions/test_live_tab_context_provider.h
new file mode 100644
index 0000000000000000000000000000000000000000..d8fe614de965590ecb080209721cb56467cab92d
--- /dev/null
+++ b/ios/public/provider/chrome/browser/sessions/test_live_tab_context_provider.h
@@ -0,0 +1,27 @@
+// Copyright 2016 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.
+
+#ifndef IOS_PUBLIC_PROVIDER_CHROME_BROWSER_SESSIONS_TEST_LIVE_TAB_CONTEXT_PROVIDER_H_
+#define IOS_PUBLIC_PROVIDER_CHROME_BROWSER_SESSIONS_TEST_LIVE_TAB_CONTEXT_PROVIDER_H_
+
+#include "base/macros.h"
+#include "ios/public/provider/chrome/browser/sessions/live_tab_context_provider.h"
+
+class TestLiveTabContextProvider : public ios::LiveTabContextProvider {
+ public:
+  TestLiveTabContextProvider() {}
+  ~TestLiveTabContextProvider() override {}
+
+  // LiveTabContextProvider.
+  sessions::LiveTabContext* Create(
+      ios::ChromeBrowserState* browser_state) override;
+  sessions::LiveTabContext* FindContextWithID(int32_t desired_id) override;
+  sessions::LiveTabContext* FindContextForTab(
+      const sessions::LiveTab* tab) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestLiveTabContextProvider);
+};
+
+#endif  // IOS_PUBLIC_PROVIDER_CHROME_BROWSER_SESSIONS_TEST_LIVE_TAB_CONTEXT_PROVIDER_H_