Keep track of braces {} in @code comments

This makes doclava more compatible with javadoc, though
it retains some differences around escaping for the moment.

This is related to a change in Javadoc behavior in JDK 5, most
likely http://bugs.java.com/bugdatabase/view_bug.do?bug_id=4965490

Bug: 25757239
Change-Id: I2b4ba4dbad520a1a3e00f394e1fac4b8d67b3fbf
diff --git a/src/com/google/doclava/Comment.java b/src/com/google/doclava/Comment.java
index 616ccc4..894bf04 100644
--- a/src/com/google/doclava/Comment.java
+++ b/src/com/google/doclava/Comment.java
@@ -164,9 +164,15 @@
   }
 
   private int findEndIndexOfInlineTag(String text, int fromIndex, int toIndex) {
+      int braceDepth = 0;
       for (int i = fromIndex; i < toIndex; i++) {
-          if (text.charAt(i) == '}') {
-              return i;
+          if (text.charAt(i) == '{') {
+              braceDepth++;
+          } else if (text.charAt(i) == '}') {
+              braceDepth--;
+              if (braceDepth == 0) {
+                  return i;
+              }
           }
       }