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/JankTracker.h b/libs/hwui/JankTracker.h
index 3887e5e..a413005 100644
--- a/libs/hwui/JankTracker.h
+++ b/libs/hwui/JankTracker.h
@@ -54,7 +54,7 @@
 // TODO: Replace DrawProfiler with this
 class JankTracker {
 public:
-    JankTracker(nsecs_t frameIntervalNanos);
+    explicit JankTracker(nsecs_t frameIntervalNanos);
     ~JankTracker();
 
     void addFrame(const FrameInfo& frame);