Introduce Image loader extension.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index 133865743ded94b818e5aa49dc2b0e45fea20ff9..fc9fd9615bd86df4a974fcd878759e5fa85c2bdb 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -202,6 +202,9 @@
       # Disable file manager component extension by default.
       'file_manager_extension%': 0,
 
+      # Disable image loader component extension by default.
+      'image_loader_extension%': 0,
+
       # Python version.
       'python_ver%': '2.6',
 
@@ -473,11 +476,13 @@
           'use_titlecase_in_grd_files%': 1,
         }],
 
-        # Enable file manager extension on Chrome OS.
+        # Enable file manager and image loader extensions on Chrome OS.
         ['chromeos==1', {
           'file_manager_extension%': 1,
+          'image_loader_extension%': 1,
         }, {
           'file_manager_extension%': 0,
+          'image_loader_extension%': 0,
         }],
 
         ['OS=="win" or OS=="mac" or (OS=="linux" and chromeos==0)', {
@@ -684,6 +689,7 @@
     'enable_touch_ui%': '<(enable_touch_ui)',
     'use_xi2_mt%':'<(use_xi2_mt)',
     'file_manager_extension%': '<(file_manager_extension)',
+    'image_loader_extension%': '<(image_loader_extension)',
     'inside_chromium_build%': '<(inside_chromium_build)',
     'fastbuild%': '<(fastbuild)',
     'dcheck_always_on%': '<(dcheck_always_on)',
@@ -1374,6 +1380,9 @@
       ['file_manager_extension==1', {
         'grit_defines': ['-D', 'file_manager_extension'],
       }],
+      ['image_loader_extension==1', {
+        'grit_defines': ['-D', 'image_loader_extension'],
+      }],
       ['remoting==1', {
         'grit_defines': ['-D', 'remoting'],
       }],
@@ -1721,6 +1730,9 @@
       ['file_manager_extension==1', {
         'defines': ['FILE_MANAGER_EXTENSION=1'],
       }],
+      ['image_loader_extension==1', {
+        'defines': ['IMAGE_LOADER_EXTENSION=1'],
+      }],
       ['profiling==1', {
         'defines': ['ENABLE_PROFILING=1'],
       }],