Added Header and Footer support using Skia

printing/print_job_constants.cc

Index: printing/print_job_constants.cc
diff --git a/printing/print_job_constants.cc b/printing/print_job_constants.cc
index 7e2f634c457320b9dded23f586ebc04f2ba4d62d..81116eb9698b97c3a6f4035aeccb6cb12ad890dd 100644
--- a/printing/print_job_constants.cc
+++ b/printing/print_job_constants.cc
@@ -24,6 +24,21 @@ const char kSettingDeviceName[] = "deviceName";
 // Print job duplex mode.
 const char kSettingDuplexMode[] = "duplex";
 
+// Option to print Headers and Footers: true if selected, false if not.
+const char kSettingHeaderFooter[] = "headerFooter";
+
+// Interstice or gap between different header footer components.
+// Hardcoded to 0.25cm = 1/10" = 7.2points
+extern const float kSettingHeaderFooterInterstice = 7.2f;
+
+// Key that specifies the title of the page that will be printed in the headers
+// and footers
+extern const char kSettingHeaderFooterTitle[] = "title";
+
+// Key that specifies the URL of the page that will be printed in the headers
+// and footers
+extern const char kSettingHeaderFooterURL[] = "url";
+
 // Page orientation: true for landscape, false for portrait.
 const char kSettingLandscape[] = "landscape";