Create a new print backend for the updated CUPS APIs

printing/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/sysroot.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
@@ skipping 151 matching lines @@
       # With a 10.8 deployment target, several other APIs are deprecated.
       # We're still on CUPS 1.4 until Linux no longer needs to support it, see
       # comment above.
       cflags += [ "-Wno-deprecated-declarations" ]
     }
 
     # PRINT_BACKEND_AVAILABLE disables the default dummy implementation
     # of the print backend and enables a custom implementation instead.
     defines += [ "PRINT_BACKEND_AVAILABLE" ]
 
-    sources += [
-      "backend/cups_helper.cc",
-      "backend/cups_helper.h",
-      "backend/print_backend_cups.cc",
-      "backend/print_backend_cups.h",
-    ]
+    if (is_chromeos) {
+      sources += [
+        "backend/cups_connection.cc",

[Lei Zhang, 2016/07/13 00:34:27]

Can we use this backend on Mac as well?

[skau, 2016/07/14 20:43:05]

It will be compatible.  I did a test on my Macbook and it worked.  However,
there's no IPP attribute to CDD translation right now so the old CUPS backend is
still needed for devices that can act as a cloud print connector.  Also, my plan
is to validate it on Chrome OS first before flipping Mac.  Sound good?

[Lei Zhang, 2016/07/19 19:32:58]

Sure. We don't have to do everything in one CL. Just wondering about the
feasibility and future work.

+        "backend/cups_connection.h",
+        "backend/cups_ipp_util.cc",
+        "backend/cups_ipp_util.h",
+        "backend/cups_printer.cc",
+        "backend/cups_printer.h",
+        "backend/print_backend_cups_ipp.cc",
+        "backend/print_backend_cups_ipp.h",
+      ]
+    } else {
+      sources += [
+        "backend/cups_helper.cc",
+        "backend/cups_helper.h",
+        "backend/print_backend_cups.cc",
+        "backend/print_backend_cups.h",
+      ]
+    }
   }
 
   if (is_chromeos) {
     defines += [ "PRINT_BACKEND_AVAILABLE" ]
 
     sources += [
       "backend/print_backend_chromeos.cc",
       "printing_context_no_system_dialog.cc",
       "printing_context_no_system_dialog.h",
     ]
@@ skipping 99 matching lines @@
       "android/java/src/org/chromium/printing/PrintManagerDelegate.java",
       "android/java/src/org/chromium/printing/PrintManagerDelegateImpl.java",
       "android/java/src/org/chromium/printing/Printable.java",
       "android/java/src/org/chromium/printing/PrintingContext.java",
       "android/java/src/org/chromium/printing/PrintingContextInterface.java",
       "android/java/src/org/chromium/printing/PrintingController.java",
       "android/java/src/org/chromium/printing/PrintingControllerImpl.java",
     ]
   }
 }