common/logging: Create a new backed for android's logcat

logging

src/common/logging/backend.h

@@ -81,6 +81,21 @@ public:
     void Write(const Entry& entry) override;
 };
 
+/**
+ * Backend that writes to the Android logcat
+ */
+class LogcatBackend : public Backend {
+public:
+    static const char* Name() {
+        return "logcat";
+    }
+
+    const char* GetName() const override {
+        return Name();
+    }
+    void Write(const Entry& entry) override;
+};
+
 /**
  * Backend that writes to a file passed into the constructor
  */