Add check_all_apis option for header ABI checker

This commit adds a header ABI checker option to check all APIs that can
be found.  Without this option, the checker by default only checks the
class/struct/enum that are directly or indirectly referred by one of the
exported symbols.  With `check_all_apis: true,`, the checker will check
all class/struct/enum.

Bug: 141709599
Test: Add `header_abi_checker: { check_all_apis: true, }` to a library
      and see breakage if I change some enum.
Change-Id: I61f90e07b60a6752fc6be4398420c1ad1291102f

cc/library.go

@@ -102,6 +102,10 @@ type LibraryProperties struct {
 
 		// Symbol tags that should be ignored from the symbol file
 		Exclude_symbol_tags []string
+
+		// Run checks on all APIs (in addition to the ones referred by
+		// one of exported ELF symbols.)
+		Check_all_apis *bool
 	}
 
 	// Order symbols in .bss section by their sizes.  Only useful for shared libraries.
@@ -978,7 +982,9 @@ func (library *libraryDecorator) linkSAbiDumpFiles(ctx ModuleContext, objs Objec
 		refAbiDumpFile := getRefAbiDumpFile(ctx, vndkVersion, fileName)
 		if refAbiDumpFile != nil {
 			library.sAbiDiff = SourceAbiDiff(ctx, library.sAbiOutputFile.Path(),
-				refAbiDumpFile, fileName, exportedHeaderFlags, ctx.isLlndk(ctx.Config()), ctx.isNdk(), ctx.isVndkExt())
+				refAbiDumpFile, fileName, exportedHeaderFlags,
+				Bool(library.Properties.Header_abi_checker.Check_all_apis),
+				ctx.isLlndk(ctx.Config()), ctx.isNdk(), ctx.isVndkExt())
 		}
 	}
 }