Integrates libjpeg-turbo into Chromium (Chromium side)

This change is the Chromium-side change that integrates libjpeg-turbo into Chromium. (We need another change for WebKit.) It adds a GYP option 'libjpeg_turbo' so we can switch from libjpeg to libjpeg-turbo and use libjpeg-turbo when its value is 1. (Unfortunately, its value must be 0 for now to avoid build breaks until we land all changes required for libjpeg-turbo.)

BUG=48789
TEST=build Chromium.
Review URL: http://codereview.chromium.org/5292007

git-svn-id: http://src.chromium.org/svn/trunk/src/build@68453 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -33,7 +33,6 @@
         '../third_party/ffmpeg/ffmpeg.gyp:*',
         '../third_party/iccjpeg/iccjpeg.gyp:*',
         '../third_party/icu/icu.gyp:*',
-        '../third_party/libjpeg/libjpeg.gyp:*',
         '../third_party/libpng/libpng.gyp:*',
         '../third_party/libwebp/libwebp.gyp:*',
         '../third_party/libxml/libxml.gyp:*',
@@ -51,6 +50,7 @@
         '../webkit/webkit.gyp:*',
         'util/build_util.gyp:*',
         'temp_gyp/googleurl.gyp:*',
+        '<(libjpeg_gyp_path):*',
       ],
       'conditions': [
         ['javascript_engine=="v8"', {

common.gypi

@@ -140,6 +140,9 @@
       # Remoting compilation is enabled by default. Set to 0 to disable.
       'remoting%': 1,
 
+      # Use libjpeg-turbo as the JPEG codec used by Chromium.
+      'use_libjpeg_turbo%': 0,
+
       'library%': '<(library)',
 
       # Variable 'component' is for cases where we would like to build some
@@ -400,6 +403,13 @@
       }, {
         'use_cups%': 0,
       }],
+      # Set the relative path from this file to the GYP file of the JPEG
+      # library used by Chromium.
+      ['use_libjpeg_turbo==1', {
+        'libjpeg_gyp_path': '../third_party/libjpeg_turbo/libjpeg.gyp',
+      }, {
+        'libjpeg_gyp_path': '../third_party/libjpeg/libjpeg.gyp',
+      }],  # use_libjpeg_turbo==1
     ],
 
     # NOTE: When these end up in the Mac bundle, we need to replace '-' for '_'