Break crashpad_handler into lib and exe for Windows

handler/handler.gyp

 # Copyright 2014 The Crashpad Authors. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
 {
   'includes': [
     '../build/crashpad.gypi',
     '../build/crashpad_in_chromium.gypi',
   ],
   'targets': [
     {
-      'target_name': 'crashpad_handler',
-      'type': 'executable',
+      # This target exists so that the crashpad_handler can be embedded into
+      # another binary.
+      'target_name': 'crashpad_handler_lib',
+      'type': 'static_library',
       'dependencies': [
         '../client/client.gyp:crashpad_client',
         '../compat/compat.gyp:crashpad_compat',
         '../minidump/minidump.gyp:crashpad_minidump',
         '../snapshot/snapshot.gyp:crashpad_snapshot',
         '../third_party/mini_chromium/mini_chromium.gyp:base',
         '../tools/tools.gyp:crashpad_tool_support',
         '../util/util.gyp:crashpad_util',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
         'crash_report_upload_thread.cc',
         'crash_report_upload_thread.h',
         'mac/crash_report_exception_handler.cc',
         'mac/crash_report_exception_handler.h',
         'mac/exception_handler_server.cc',
         'mac/exception_handler_server.h',
-        'main.cc',
+        'handler_main.cc',
+        'handler_main.h',
         'win/crash_report_exception_handler.cc',
         'win/crash_report_exception_handler.h',
       ],
+    },
+    {
+      'target_name': 'crashpad_handler',
+      'type': 'executable',
+      'dependencies': [
+        '../third_party/mini_chromium/mini_chromium.gyp:base',
+        '../tools/tools.gyp:crashpad_tool_support',
+        'crashpad_handler_lib',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        'main.cc',
+      ],
 
       'conditions': [
         ['OS=="mac"', {
           # In an in-Chromium build with component=shared_library,
           # crashpad_handler will depend on shared libraries such as
           # libbase.dylib located in out/{Debug,Release} via the @rpath
           # mechanism. When crashpad_handler is copied to its home deep inside
           # the Chromium app bundle, it needs to have an LC_RPATH command
           # pointing back to the directory containing these dependency
           # libraries.
@@ skipping 71 matching lines @@
               ],
             },
           ],
         }],
       ],
     }, {
       'targets': [],
     }],
   ],
 }