Added Header and Footer support using Skia

printing/print_job_constants.h

Index: printing/print_job_constants.h
diff --git a/printing/print_job_constants.h b/printing/print_job_constants.h
index e877a0129417853afcb285cfc9bd19957d24a876..87afdee690d0ba95cd1465f492fe069c9115f869 100644
--- a/printing/print_job_constants.h
+++ b/printing/print_job_constants.h
@@ -14,6 +14,13 @@ extern const char kSettingColor[];
 extern const char kSettingCopies[];
 extern const char kSettingDeviceName[];
 extern const char kSettingDuplexMode[];
+extern const char kSettingHeaderFooter[];
+extern const char kSettingHeaderFooterFontName[];
+extern const int kSettingHeaderFooterFontSize;
+extern const float kSettingHeaderFooterHorizontalRegions;
+extern const float kSettingHeaderFooterInterstice;
+extern const char kSettingHeaderFooterTitle[];
+extern const char kSettingHeaderFooterURL[];
 extern const char kSettingLandscape[];
 extern const char kSettingPageRange[];
 extern const char kSettingPageRangeFrom[];
@@ -28,6 +35,19 @@ enum DuplexMode {
   SHORT_EDGE,
 };
 
+// Specifies the horizontal alignment of the Headers and Footers.
+enum HorizontalHeaderFooterPosition {
+  LEFT,
+  CENTER,
+  RIGHT
+};
+
+// Specifies the vertical alignment of the Headers and Footers.
+enum VerticalHeaderFooterPosition {
+  TOP,
+  BOTTOM
+};
+
 }  // namespace printing
 
 #endif  // PRINTING_PRINT_JOB_CONSTANTS_H_