[telemetry] Implement per-pixel algorithms in Bitmap as a C++ extension.

tools/telemetry/telemetry.gyp

+# 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.
+
+{
+  'targets' : [
+    {
+      'target_name': 'bitmaptools',
+      'type': 'none',
+      'variables': {
+        'output_path': '<(PRODUCT_DIR)',
+      },
+      'conditions': [
+        ['OS=="android" or OS=="linux" or OS=="mac"', {
+          'variables': {
+            'python_extension': '.so'
+          },
+        }],
+        ['OS=="win"', {
+          'variables': {
+            'python_extension': '.pyd'
+          },
+        }],
+        ['OS=="android" or OS=="linux" or OS=="mac" or OS=="win"', {
+          'actions': [{
+            'action_name': 'bitmaptools',
+            'inputs': [
+              'telemetry/core/build_extension.py',
+              'telemetry/core/bitmaptools/bitmaptools.cc',
+            ],
+            'outputs': [
+              '<(output_path)/bitmaptools>(python_extension)'
+            ],
+            'action': [
+              'python',
+              '<@(_inputs)',
+              '<(output_path)',
+              'bitmaptools',
+            ]
+          }],
+        }],
+      ]
+    },
+  ],
+}