Make most of the tests pass on Android.

- Link with -static-libstdc++ to avoid a runtime dependency on the NDK libc++.
- Relax the regular expression matching the path to ar. If the path is
  sufficiently long then gyp will wrap the line, causing the match to fail.
- The crashpad_handler binary needs to be pushed to the device,
  otherwise a number of tests fail or hang.

Now the only tests that fail on my device are:

[  FAILED  ] DebugRendezvous.Self
[  FAILED  ] DebugRendezvous.Child
[  FAILED  ] ProcessReaderLinux.SelfModules
[  FAILED  ] ProcessReaderLinux.ChildModules

Change-Id: I951a22cea5bce453d858da49a49b6a8defc1461c
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/1536652
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Peter Collingbourne <pcc@chromium.org>

build/crashpad.gypi

@@ -35,6 +35,11 @@
           }],
         ],
       }],
+      ['OS=="android"', {
+        'ldflags': [
+          '-static-libstdc++',
+        ],
+      }],
     ],
   },
 }

build/run_tests.py

@@ -87,7 +87,7 @@ def _BinaryDirTargetOS(binary_dir):
   if os.path.exists(build_ninja_path):
     with open(build_ninja_path) as build_ninja_file:
       build_ninja_content = build_ninja_file.read()
-      match = re.search('^ar = .+-linux-android(eabi)?-ar$',
+      match = re.search('-linux-android(eabi)?-ar$',
                         build_ninja_content,
                         re.MULTILINE)
       if match:
@@ -237,7 +237,7 @@ def _RunOnAndroidTarget(binary_dir, test, android_device, extra_command_line):
     # determined automatically in a GN build, following the example used for
     # Fuchsia. Since nothing like that exists for GYP, hard-code it for
     # supported tests.
-    test_build_artifacts = [test]
+    test_build_artifacts = [test, 'crashpad_handler']
     test_data = ['test/test_paths_test_data_root.txt']
 
     if test == 'crashpad_test_test':