Handle the case where a single-line comment is less than 3 characters long.

R=rudominer@chromium.org, rudominer
BUG= #592

Review URL: https://codereview.chromium.org/1822233002 .

mojo/public/tools/bindings/mojom_tool/bin/linux64/mojom.sha1

diff --git a/mojo/public/tools/bindings/mojom_tool/bin/linux64/mojom.sha1 b/mojo/public/tools/bindings/mojom_tool/bin/linux64/mojom.sha1
index f877b06..d8bc4a8 100644
--- a/mojo/public/tools/bindings/mojom_tool/bin/linux64/mojom.sha1
+++ b/mojo/public/tools/bindings/mojom_tool/bin/linux64/mojom.sha1
@@ -1 +1 @@
-4cf9bd6d35321e593c7f020fd7575a6085fb1647
\ No newline at end of file
+c40dec5fd197ccd4c933404f8b382587a089afad
\ No newline at end of file

mojo/public/tools/bindings/mojom_tool/bin/mac64/mojom.sha1

diff --git a/mojo/public/tools/bindings/mojom_tool/bin/mac64/mojom.sha1 b/mojo/public/tools/bindings/mojom_tool/bin/mac64/mojom.sha1
index d4f2e23..c5bdae1 100644
--- a/mojo/public/tools/bindings/mojom_tool/bin/mac64/mojom.sha1
+++ b/mojo/public/tools/bindings/mojom_tool/bin/mac64/mojom.sha1
@@ -1 +1 @@
-18499cedacd5eb9953ecbb41cf0d7a5811289051
\ No newline at end of file
+9498acaa38bc428dea6d84e2e45e552dd15ff466
\ No newline at end of file

mojom/mojom_parser/formatter/printer.go

diff --git a/mojom/mojom_parser/formatter/printer.go b/mojom/mojom_parser/formatter/printer.go
index 821defa..6de06c3 100644
--- a/mojom/mojom_parser/formatter/printer.go
+++ b/mojom/mojom_parser/formatter/printer.go
@@ -664,8 +664,7 @@
 
 	// We expect that the first 2 characters are // followed by a space or tab.
 	// If the third character is not a space or tab, we insert a space.
-	space := commentText[2]
-	if space != ' ' && space != '\t' {
+	if len(commentText) > 2 && commentText[2] != ' ' && commentText[2] != '\t' {
 		commentText = "// " + commentText[2:]
 	}
 	p.write(commentText)