Revise the SystemState hierarchy.

* Removed all #includes from SystemState; added includes in .cc files
  that use the various objects (MetricsLibrary, DevicePolicy, etc).

* MockSystemState:

  - Regulated the set of getters/setters: foo() returns the current Foo
    object interface; this object can be overridden by set_foo();
    mock_foo() or fake_foo() returns the default (internal) mock/fake
    equivalent, and fails if it is different from foo() (safety).

  - Make member declaration order consistent with that of API.

  - Removed MOCK_METHOD declarations for two methods and replaced them
    with fake getter/setter. This means that MockSystemState is now
    reduced to a fake, and can be renamed (separate CL). This also means
    that a few tests have a slightly different semantics now.

* All virtual overrides are qualified as such. However, removed the
  'const' method qualified from all getters: it made little sense,
  especially when considering that getters are handing addresses of
  internal mock members.

* Made the UpdateAttempter a contained member of both
  {Real,Mock}SystemState, resolving initialization dependencies. In
  general, the invariant is that all members of the SystemState that
  rely on it being fully populated by the time of their initialization,
  need to export a separate Init() method, that will be called (by the
  SystemState implementation constructor or Init() method) only after
  all members are set.

* Made the mock GPIO handler and connection manager contained members of
  MockSystemState; the destructor could safely be moved.

* Cleanup in UpdateAttempter (part of resolving dependencies):

  - Ordinary member initialization done via default initializers
    (constants) or initializer list in the constructor (parameters).

  - Init() method only does work that cannot be done during
    construction, with appropriate comment documenting the need for it.

  - Better reuse via constructor delegation.

BUG=chromium:358278
TEST=Unit tests.

Change-Id: I96ff6fc7e7400b0a9feb6cc8d4ffe97a51000f91
Reviewed-on: https://chromium-review.googlesource.com/193587
Reviewed-by: Gilad Arnold <garnold@chromium.org>
Tested-by: Gilad Arnold <garnold@chromium.org>
Commit-Queue: David Zeuthen <zeuthen@chromium.org>
diff --git a/mock_system_state.cc b/mock_system_state.cc
index e7ec886..a821836 100644
--- a/mock_system_state.cc
+++ b/mock_system_state.cc
@@ -12,28 +12,26 @@
 // Mock the SystemStateInterface so that we could lie that
 // OOBE is completed even when there's no such marker file, etc.
 MockSystemState::MockSystemState()
-  : default_request_params_(this),
-    clock_(&default_clock_),
-    hardware_(&default_hardware_),
+  : mock_connection_manager_(this),
+    mock_update_attempter_(this, &dbus_),
+    default_request_params_(this),
+    clock_(&fake_clock_),
+    connection_manager_(&mock_connection_manager_),
+    hardware_(&fake_hardware_),
+    metrics_lib_(&mock_metrics_lib_),
     prefs_(&mock_prefs_),
     powerwash_safe_prefs_(&mock_powerwash_safe_prefs_),
-    p2p_manager_(&mock_p2p_manager_),
     payload_state_(&mock_payload_state_),
-    policy_manager_(&fake_policy_manager_) {
-  request_params_ = &default_request_params_;
+    gpio_handler_(&mock_gpio_handler_),
+    update_attempter_(&mock_update_attempter_),
+    request_params_(&default_request_params_),
+    p2p_manager_(&mock_p2p_manager_),
+    policy_manager_(&fake_policy_manager_),
+    device_policy_(nullptr),
+    fake_system_rebooted_(false) {
   mock_payload_state_.Initialize(this);
-  mock_gpio_handler_ = new testing::NiceMock<MockGpioHandler>();
-  mock_update_attempter_ = new testing::NiceMock<UpdateAttempterMock>(
-      this, &dbus_);
-  mock_connection_manager_ = new testing::NiceMock<MockConnectionManager>(this);
-  connection_manager_ = mock_connection_manager_;
+  mock_update_attempter_.Init();
   fake_policy_manager_.Init(FakeState::Construct());
 }
 
-MockSystemState::~MockSystemState() {
-  delete mock_connection_manager_;
-  delete mock_update_attempter_;
-  delete mock_gpio_handler_;
-}
-
 }  // namespace chromeos_update_engine