Fix google-explicit-constructor warnings in frameworks/base

* Add explicit keyword to conversion constructors.
* Add NOLINT to implicit conversion constructors.

Bug: 28341362
Test: build with clang-tidy
Change-Id: Ie4d37072ab57d1662d18db4de1c8577247f43337
diff --git a/libs/hwui/AnimatorManager.h b/libs/hwui/AnimatorManager.h
index fb75eb8..96ff07a 100644
--- a/libs/hwui/AnimatorManager.h
+++ b/libs/hwui/AnimatorManager.h
@@ -35,7 +35,7 @@
 class AnimatorManager {
     PREVENT_COPY_AND_ASSIGN(AnimatorManager);
 public:
-    AnimatorManager(RenderNode& parent);
+    explicit AnimatorManager(RenderNode& parent);
     ~AnimatorManager();
 
     void addAnimator(const sp<BaseRenderNodeAnimator>& animator);