Simplify libcrash_dumper interface and make window_manager gen crash dumps

src/platform/window_manager/SConstruct

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
 import itertools
 
 import make_shaders
 
 Help('''\
@@ skipping 158 matching lines @@
 
 # Define a library to be used by tests.
 srcs = Split('''\
   mock_gl_interface.cc
   mock_x_connection.cc
   test_lib.cc
 ''')
 libtest = wm_env.Library('test', Split(srcs))
 
 wm_env.Prepend(LIBS=[libwm_core, libwm_ipc])
-if 'USE_BREAKPAD' in ARGUMENTS:
-  wm_env.Append(CPPDEFINES=['USE_BREAKPAD'], LIBS=['libbreakpad'])
 
 backend_defines = {'opengl': ['COMPOSITOR_OPENGL'],
                    'opengles': ['COMPOSITOR_OPENGLES']}
 wm_env.Append(CPPDEFINES=backend_defines[backend])
 
+# Do not include crash dumper in the unit test environment
+test_env = wm_env.Clone()
+wm_env.Append(LIBS=['libcrash'])
+
 wm_env.Program('wm', 'main.cc')
 
-test_env = wm_env.Clone()
 test_env.Append(LIBS=['gtest'])
 # libtest needs to be listed first since it depends on wm_core and wm_ipc.
 test_env.Prepend(LIBS=[libtest])
 tests = []
 
 # These are tests that only get built when we use particular backends
 backend_tests = {'opengl': ['real_compositor_test.cc',
                             'opengl_visitor_test.cc'],
                  'opengles': []}
 all_backend_tests = set(itertools.chain(*backend_tests.values()))
 for test_src in Glob('*_test.cc', strings=True):
   if test_src in all_backend_tests and test_src not in backend_tests[backend]:
     continue
   tests += test_env.Program(test_src)
 # Create a 'tests' target that will build all tests.
 test_env.Alias('tests', tests)
 
 # mock_chrome is just a small program that developers can use to test
 # interaction between the window manager and Chrome.  We only define a
 # target for it if gtkmm is installed so that this SConstruct file can
 # still be parsed in the chroot build environment, which shouldn't contain
 # gtkmm.
 if os.system('pkg-config --exists gtkmm-2.4') == 0:
   mock_chrome_env = wm_env.Clone()
   mock_chrome_env.ParseConfig('pkg-config --cflags --libs gtkmm-2.4')
   mock_chrome_env.Program('mock_chrome', 'mock_chrome.cc')