win: Add and use a custom CaptureContext() implementation

snapshot/win/exception_snapshot_win_test.cc

 // Copyright 2015 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,
@@ skipping 174 matching lines @@
   void ExceptionHandlerServerStarted() override { SetEvent(server_ready_); }
 
   unsigned int ExceptionHandlerServerException(
       HANDLE process,
       WinVMAddress exception_information_address) override {
     ScopedProcessSuspend suspend(process);
     ProcessSnapshotWin snapshot;
     snapshot.Initialize(process, ProcessSuspensionState::kSuspended);
     snapshot.InitializeException(exception_information_address);
     EXPECT_TRUE(snapshot.Exception());
-    EXPECT_EQ(0, snapshot.Exception()->Exception());
-    EXPECT_EQ(0, snapshot.Exception()->ExceptionAddress());
+    EXPECT_EQ(0x517a7ed, snapshot.Exception()->Exception());
 
     // Verify the dump was captured at the expected location with some slop
     // space.
     const uint64_t kAllowedOffset = 64;
     EXPECT_GT(snapshot.Exception()->Context()->InstructionPointer(),
               dump_near_);
     EXPECT_LT(snapshot.Exception()->Context()->InstructionPointer(),
               dump_near_ + kAllowedOffset);
 
+    EXPECT_EQ(snapshot.Exception()->Context()->InstructionPointer(),
+              snapshot.Exception()->ExceptionAddress());
+
     SetEvent(completed_test_event_);
 
     return 0;
   }
 
  private:
   HANDLE server_ready_;  // weak
   HANDLE completed_test_event_;  // weak
   WinVMAddress dump_near_;
 
@@ skipping 50 matching lines @@
   TestDumpWithoutCrashingChild(FILE_PATH_LITERAL("..\\..\\out\\Debug"));
 #else
   TestDumpWithoutCrashingChild(FILE_PATH_LITERAL("..\\..\\out\\Release"));
 #endif
 }
 #endif  // ARCH_CPU_64_BITS
 
 }  // namespace
 }  // namespace test
 }  // namespace crashpad