Fix clang-tidy warnings in aapt and aapt2.

* Add explicit keyword to conversion constructors.
* Add NOLINT(implicit) comments for implicit conversion constructors.
Bug: 28341362
* Use const reference type for read-only parameters.
Bug: 30407689
* Use const reference type to avoid unnecessary copy.
Bug: 30413862
Test: build with WITH_TIDY=1

Change-Id: Id6d21961f313a1ad92b15a37fdaa5be9e8ab48e1
diff --git a/tools/aapt2/process/SymbolTable.h b/tools/aapt2/process/SymbolTable.h
index 43f4dd7..bd01b64 100644
--- a/tools/aapt2/process/SymbolTable.h
+++ b/tools/aapt2/process/SymbolTable.h
@@ -86,7 +86,7 @@
      * are typically stored in a cache which may evict entries.
      */
     const Symbol* findByName(const ResourceName& name);
-    const Symbol* findById(ResourceId id);
+    const Symbol* findById(const ResourceId& id);
 
     /**
      * Let's the ISymbolSource decide whether looking up by name or ID is faster, if both