Add a gyp flag to allow removing dependency on ppapi.

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 354 matching lines @@
       # for details.
       'chromium_win_pch%': 0,
 
       # Set this to true when building with Clang.
       # See http://code.google.com/p/chromium/wiki/Clang for details.
       'clang%': 0,
 
       # Enable plug-in installation by default.
       'enable_plugin_installation%': 1,
 
+      # Enable ppapi by default.
+      'enable_ppapi%': 1,
+
       # Enable protector service by default.
       'enable_protector_service%': 1,
 
       # Specifies whether to use canvas_skia.cc in place of platform
       # specific implementations of gfx::Canvas. Affects text drawing in the
       # Chrome UI.
       # TODO(asvitkine): Enable this on all platforms and delete this flag.
       #                  http://crbug.com/105550
       'use_canvas_skia%': 0,
 
@@ skipping 129 matching lines @@
           'chromium_win_pch%': 1
         }],
 
         ['use_aura==1 or chromeos==1 or OS=="android"', {
           'enable_plugin_installation%': 0,
         }, {
           'enable_plugin_installation%': 1,
         }],
 
         ['OS=="android" or OS=="ios"', {
+          'enable_ppapi%': 0,
+        }, {
+          'enable_ppapi%': 1,
+        }],
+
+        ['OS=="android" or OS=="ios"', {
           'enable_protector_service%': 0,
         }, {
           'enable_protector_service%': 1,
         }],
 
         # linux_use_gold_binary: whether to use the binary checked into
         # third_party/gold.
         ['OS=="linux"', {
           'linux_use_gold_binary%': 1,
         }, {
@@ skipping 129 matching lines @@
     'asan%': '<(asan)',
     'tsan%': '<(tsan)',
     'tsan_blacklist%': '<(tsan_blacklist)',
     'clang_type_profiler%': '<(clang_type_profiler)',
     'order_profiling%': '<(order_profiling)',
     'order_text_section%': '<(order_text_section)',
     'enable_extensions%': '<(enable_extensions)',
     'enable_web_intents%': '<(enable_web_intents)',
     'enable_web_intents_tag%': '<(enable_web_intents_tag)',
     'enable_plugin_installation%': '<(enable_plugin_installation)',
+    'enable_ppapi%': '<(enable_ppapi)',
     'enable_protector_service%': '<(enable_protector_service)',
     'enable_session_service%': '<(enable_session_service)',
     'enable_themes%': '<(enable_themes)',
     'use_oem_wallpaper%': '<(use_oem_wallpaper)',
     'enable_background%': '<(enable_background)',
     'linux_use_gold_binary%': '<(linux_use_gold_binary)',
     'linux_use_gold_flags%': '<(linux_use_gold_flags)',
     'use_canvas_skia%': '<(use_canvas_skia)',
     'test_isolation_mode%': '<(test_isolation_mode)',
     'test_isolation_outdir%': '<(test_isolation_outdir)',
@@ skipping 1175 matching lines @@
       }],
       ['OS=="win" and branding=="Chrome"', {
         'defines': ['ENABLE_SWIFTSHADER'],
       }],
       ['enable_dart==1', {
         'defines': ['WEBKIT_USING_DART=1'],
       }],
       ['enable_plugin_installation==1', {
         'defines': ['ENABLE_PLUGIN_INSTALLATION=1'],
       }],
+      ['enable_ppapi==1', {
+        'defines': ['ENABLE_PPAPI=1'],
+      }],
       ['enable_protector_service==1', {
         'defines': ['ENABLE_PROTECTOR_SERVICE=1'],
       }],
       ['enable_session_service==1', {
         'defines': ['ENABLE_SESSION_SERVICE=1'],
       }],
       ['enable_themes==1', {
         'defines': ['ENABLE_THEMES=1'],
       }],
       ['enable_background==1', {
@@ skipping 2000 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }