Part two of fallback crash handler for Crashpad handler process.

components/crash/content/app/BUILD.gn

Index: components/crash/content/app/BUILD.gn
diff --git a/components/crash/content/app/BUILD.gn b/components/crash/content/app/BUILD.gn
index 7552646936c5e62055f5d7ea60375a565472f270..23255030fa61386082044dcbf42baaa1155c26d4 100644
--- a/components/crash/content/app/BUILD.gn
+++ b/components/crash/content/app/BUILD.gn
@@ -68,13 +68,17 @@ if (is_win) {
       "crash_switches.h",
       "fallback_crash_handler_launcher_win.cc",
       "fallback_crash_handler_launcher_win.h",
+      "fallback_crash_handler_win.cc",
+      "fallback_crash_handler_win.h",
       "run_as_crashpad_handler_win.cc",
       "run_as_crashpad_handler_win.h",
     ]
 
     deps = [
       "//base",
+      "//third_party/crashpad/crashpad/client",
       "//third_party/crashpad/crashpad/handler:handler_lib",
+      "//third_party/crashpad/crashpad/minidump",
     ]
   }
 }
@@ -216,6 +220,7 @@ source_set("unit_tests") {
   sources = [
     "crash_keys_win_unittest.cc",
     "fallback_crash_handler_launcher_win_unittest.cc",
+    "fallback_crash_handler_win_unittest.cc",
   ]
   deps = [
     ":lib",
@@ -229,6 +234,10 @@ source_set("unit_tests") {
     deps += [
       ":run_as_crashpad_handler",
       "//breakpad:client",
+      "//third_party/crashpad/crashpad/client:client",
+      "//third_party/crashpad/crashpad/compat",
+      "//third_party/crashpad/crashpad/snapshot:snapshot",
+      "//third_party/crashpad/crashpad/util",
     ]
   }
 }