Merge "Add a debug utility for InputMethodUtils"

core/java/com/android/internal/inputmethod/InputMethodUtils.java

@@ -72,6 +72,28 @@ public class InputMethodUtils {
         }
         return sb.toString();
     }
+
+    public static String getApiCallStack() {
+        String apiCallStack = "";
+        try {
+            throw new RuntimeException();
+        } catch (RuntimeException e) {
+            final StackTraceElement[] frames = e.getStackTrace();
+            for (int j = 1; j < frames.length; ++j) {
+                final String tempCallStack = frames[j].toString();
+                if (TextUtils.isEmpty(apiCallStack)) {
+                    // Overwrite apiCallStack if it's empty
+                    apiCallStack = tempCallStack;
+                } else if (tempCallStack.indexOf("Transact(") < 0) {
+                    // Overwrite apiCallStack if it's not a binder call
+                    apiCallStack = tempCallStack;
+                } else {
+                    break;
+                }
+            }
+        }
+        return apiCallStack;
+    }
     // ----------------------------------------------------------------------
 
     public static boolean isSystemIme(InputMethodInfo inputMethod) {