Merge 97702, 97820, 97976

printing/print_job_constants.cc

Index: printing/print_job_constants.cc
===================================================================
--- printing/print_job_constants.cc	(revision 98330)
+++ printing/print_job_constants.cc	(working copy)
@@ -12,6 +12,9 @@
 // Unique ID sent along every preview request.
 const char kPreviewRequestID[] = "requestID";
 
+// Unique ID to identify a print preview UI.
+const char kPreviewUIAddr[] = "previewUIAddr";
+
 // Print using cloud print: true if selected, false if not.
 const char kSettingCloudPrintId[] = "cloudPrintID";
 
@@ -48,10 +51,8 @@
 // Print to PDF option: true if selected, false if not.
 const char kSettingPrintToPDF[] = "printToPDF";
 
-// Indices used to represent first page, invalid page and complete
-// preview document.
+// Indices used to represent first preview page and complete preview document.
 const int FIRST_PAGE_INDEX = 0;
 const int COMPLETE_PREVIEW_DOCUMENT_INDEX = -1;
-const int INVALID_PAGE_INDEX = -2;
 
 }  // namespace printing