Android: Add usage statistics to android.

Added an option in General config to enable/disable usage statistics. Added a popup on first open if
the user would like to engage in reporting. Clicking cancel or out of the box opts out. Only
clicking 'Ok' will enable reporting. Also added a new android specific values to report.

Source/Core/Common/Analytics.cpp

@@ -190,5 +190,4 @@ void HttpAnalyticsBackend::Send(std::string report)
   if (m_http.IsValid())
     m_http.Post(m_endpoint, report);
 }
-
 }  // namespace Common

Source/Core/Common/Analytics.h

@@ -183,5 +183,4 @@ protected:
   std::string m_endpoint;
   HttpRequest m_http{std::chrono::seconds{5}};
 };
-
 }  // namespace Common

Source/Core/Common/AndroidAnalytics.cpp

@@ -0,0 +1,27 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <functional>
+#include <string>
+
+#include "Common/AndroidAnalytics.h"
+
+namespace Common
+{
+std::function<void(std::string, std::string)> s_android_send_report;
+void AndroidSetReportHandler(std::function<void(std::string, std::string)> func)
+{
+  s_android_send_report = std::move(func);
+}
+AndroidAnalyticsBackend::AndroidAnalyticsBackend(std::string passed_endpoint)
+    : m_endpoint{std::move(passed_endpoint)}
+{
+}
+AndroidAnalyticsBackend::~AndroidAnalyticsBackend() = default;
+
+void AndroidAnalyticsBackend::Send(std::string report)
+{
+  s_android_send_report(m_endpoint, report);
+}
+}  // namespace Common

Source/Core/Common/AndroidAnalytics.h

@@ -0,0 +1,26 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+#pragma once
+
+#include <functional>
+#include <string>
+
+#include "Common/Analytics.h"
+
+namespace Common
+{
+void AndroidSetReportHandler(std::function<void(std::string, std::string)> function);
+
+class AndroidAnalyticsBackend : public AnalyticsReportingBackend
+{
+public:
+  explicit AndroidAnalyticsBackend(const std::string endpoint);
+
+  ~AndroidAnalyticsBackend() override;
+  void Send(std::string report) override;
+
+private:
+  std::string m_endpoint;
+};
+}  // namespace Common

Source/Core/Common/CMakeLists.txt

@@ -71,6 +71,7 @@ endif()
 
 if(ANDROID)
   target_sources(common PRIVATE
+    AndroidAnalytics.cpp
     Logging/ConsoleListenerDroid.cpp
   )
 elseif(WIN32)