Split bugreport() into its own file and added unit tests.

bugreport() will be soon refactored to track progress, which will
require more comprehensive unit tests.

As such, it's better to move it to its own files, which in turn also
requires moving send_shell_command() and usage() to commandline.h.

Fixes: 30100363
Bug: 30268737

Change-Id: I3cdf114a0b5547293320042ff0749a60886440b0
diff --git a/commandline.h b/commandline.h
new file mode 100644
index 0000000..39764b4
--- /dev/null
+++ b/commandline.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef COMMANDLINE_H
+#define COMMANDLINE_H
+
+#include "adb.h"
+
+int adb_commandline(int argc, const char** argv);
+int usage();
+
+// Connects to the device "shell" service with |command| and prints the
+// resulting output.
+int send_shell_command(TransportType transport_type, const char* serial, const std::string& command,
+                       bool disable_shell_protocol, std::string* output = nullptr,
+                       std::string* err = nullptr);
+
+#endif  // COMMANDLINE_H