Move SkAndroidSDKCanvas to tools and ensure that it is built on all Android builds

gyp/tools.gyp

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
     # GYP file to build various tools.
 #
 # To build on Linux:
 #  ./gyp_skia tools.gyp && make tools
 #
 {
@@ skipping 24 matching lines @@
         'whitelist_typefaces',
       ],
       'conditions': [
         ['skia_shared_lib',
           {
             'dependencies': [
               'sklua', # This can only be built if skia is built as a shared library
             ],
           },
         ],
+        [ 'skia_os == "android"',
+          {
+            'dependencies': [
+               # Build this by default to catch compile errors more quickly, since
+               # the only other time this code is exercised in the android framework
+              'android_utils',
+            ],
+          },
+        ],
       ],
     },
     {
+      'target_name': 'android_utils',
+      'type': 'static_library',
+      'dependencies': [
+        'core.gyp:core',
+      ],
+      'sources': [
+        '../tools/android/SkAndroidSDKCanvas.h',
+        '../tools/android/SkAndroidSDKCanvas.cpp',
+      ],
+      'direct_dependent_settings': {
+        'include_dirs': [
+          '../tools/android',
+        ],
+      },
+    },
+    {
         'target_name': 'dump_record',
         'type': 'executable',
         'sources': [
             '../tools/dump_record.cpp',
             '../tools/DumpRecord.cpp',
          ],
          'include_dirs': [
             '../include/private',
             '../src/core',
          ],
@@ skipping 487 matching lines @@
               'flags.gyp:flags',
               'skia_lib.gyp:skia_lib',
               'resources',
             ],
           },
         ],
       },
     ],
   ],
 }