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 1997673d73b7e9e96bb807204b09376cd1fd24d1..89a6e6429bc20006c8f1a75688a040797c091294 100644
--- a/printing/print_job_constants.h
+++ b/printing/print_job_constants.h
@@ -15,6 +15,15 @@ extern const char kSettingColor[];
 extern const char kSettingCopies[];
 extern const char kSettingDeviceName[];
 extern const char kSettingDuplexMode[];
+extern const char kSettingHeaderFooterEnabled[];
+extern const char kSettingHeaderFooterFontFamilyName[];
+extern const char kSettingHeaderFooterFontName[];
+extern const int kSettingHeaderFooterFontSize;
+extern const float kSettingHeaderFooterHorizontalRegions;
+extern const float kSettingHeaderFooterInterstice;
+extern const char kSettingHeaderFooterDate[];
+extern const char kSettingHeaderFooterTitle[];
+extern const char kSettingHeaderFooterURL[];
 extern const char kSettingLandscape[];
 extern const char kSettingPageRange[];
 extern const char kSettingPageRangeFrom[];
@@ -33,6 +42,19 @@ 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_