Add trace flag for cpp/Java AIDL generation.

am: eab15645fe

Change-Id: Ia5d3724387ec0a1e0b1c5c80b02958512fc3bfec

cc/compiler.go

@@ -106,6 +106,9 @@ type BaseCompilerProperties struct {
 		// list of directories relative to the Blueprints file that will
 		// be added to the aidl include paths.
 		Local_include_dirs []string
+
+		// whether to generate traces (for systrace) for this interface
+		Generate_traces *bool
 	}
 
 	Renderscript struct {
@@ -473,6 +476,10 @@ func (compiler *baseCompiler) compilerFlags(ctx ModuleContext, flags Flags, deps
 			flags.aidlFlags = append(flags.aidlFlags, includeDirsToFlags(rootAidlIncludeDirs))
 		}
 
+		if Bool(compiler.Properties.Aidl.Generate_traces) {
+			flags.aidlFlags = append(flags.aidlFlags, "-t")
+		}
+
 		flags.GlobalFlags = append(flags.GlobalFlags,
 			"-I"+android.PathForModuleGen(ctx, "aidl").String())
 	}

java/java.go

@@ -178,6 +178,9 @@ type CompilerDeviceProperties struct {
 		// directories that should be added as include directories for any aidl sources of modules
 		// that depend on this module, as well as to aidl for this module.
 		Export_include_dirs []string
+
+		// whether to generate traces (for systrace) for this interface
+		Generate_traces *bool
 	}
 
 	// If true, export a copy of the module as a -hostdex module for host testing.
@@ -558,6 +561,10 @@ func (j *Module) aidlFlags(ctx android.ModuleContext, aidlPreprocess android.Opt
 		flags = append(flags, "-I"+src.String())
 	}
 
+	if Bool(j.deviceProperties.Aidl.Generate_traces) {
+		flags = append(flags, "-t")
+	}
+
 	return flags
 }