Move settings setup for PDF and cloud print into single location in PrintingContext

printing/units.h

Index: printing/units.h
diff --git a/printing/units.h b/printing/units.h
index 8f028324301ab7f02915bd8a54af4258318aae5a..0e6cfd2ca40997cb4ff2b997507371b6c4422135 100644
--- a/printing/units.h
+++ b/printing/units.h
@@ -9,7 +9,7 @@
 
 namespace printing {
 
-// Length of a thousanth of inches in 0.01mm unit.
+// Length of a thousandth of inches in 0.01mm unit.
 const int kHundrethsMMPerInch = 2540;
 
 // Length of an inch in CSS's 1pt unit.
@@ -20,6 +20,25 @@ const int kPointsPerInch = 72;
 // http://dev.w3.org/csswg/css3-values/#the-px-unit
 const int kPixelsPerInch = 96;
 
+// Dpi used to save to PDF or Cloud Print.
+const int kDefaultPdfDpi = 300;
+
+// LETTER: 8.5 x 11 inches
+const float kLetterWidthInch = 8.5f;
+const float kLetterHeightInch = 11.0f;
+
+// LEGAL: 8.5 x 14 inches
+const float kLegalWidthInch = 8.5f;
+const float kLegalHeightInch = 14.0f;
+
+// A4: 8.27 x 11.69 inches
+const float kA4WidthInch = 8.27f;
+const float kA4HeightInch = 11.69f;
+
+// A3: 11.69 x 16.54 inches
+const float kA3WidthInch = 11.69f;
+const float kA3HeightInch = 16.54f;
+
 // Converts from one unit system to another using integer arithmetics.
 PRINTING_EXPORT int ConvertUnit(int value, int old_unit, int new_unit);