Fix google-explicit-constructor warnings.

Bug: 28341362
Change-Id: I625fbab25f16282c2ea929cd16283d9d146fa17b
diff --git a/media/common_time/ICommonClock.cpp b/media/common_time/ICommonClock.cpp
index 19b7d6e..f1f1fca 100644
--- a/media/common_time/ICommonClock.cpp
+++ b/media/common_time/ICommonClock.cpp
@@ -48,7 +48,7 @@
 class BpCommonClock : public BpInterface<ICommonClock>
 {
   public:
-    BpCommonClock(const sp<IBinder>& impl)
+    explicit BpCommonClock(const sp<IBinder>& impl)
         : BpInterface<ICommonClock>(impl) {}
 
     virtual status_t isCommonTimeValid(bool* valid, uint32_t* timelineID) {
@@ -401,7 +401,7 @@
 class BpCommonClockListener : public BpInterface<ICommonClockListener>
 {
   public:
-    BpCommonClockListener(const sp<IBinder>& impl)
+    explicit BpCommonClockListener(const sp<IBinder>& impl)
         : BpInterface<ICommonClockListener>(impl) {}
 
     virtual void onTimelineChanged(uint64_t timelineID) {
diff --git a/media/common_time/ICommonTimeConfig.cpp b/media/common_time/ICommonTimeConfig.cpp
index 67167b0..e587b39 100644
--- a/media/common_time/ICommonTimeConfig.cpp
+++ b/media/common_time/ICommonTimeConfig.cpp
@@ -50,7 +50,7 @@
 class BpCommonTimeConfig : public BpInterface<ICommonTimeConfig>
 {
   public:
-    BpCommonTimeConfig(const sp<IBinder>& impl)
+    explicit BpCommonTimeConfig(const sp<IBinder>& impl)
         : BpInterface<ICommonTimeConfig>(impl) {}
 
     virtual status_t getMasterElectionPriority(uint8_t *priority) {