[Mac] Modify the ObjC exception preprocessor to make some exceptions fatal.

chrome/browser/chrome_browser_application_mac_unittest.mm

-// Copyright (c) 2012 The Chromium 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 "chrome/browser/chrome_browser_application_mac.h"
-
-#import <Cocoa/Cocoa.h>
-#include <stddef.h>
-
-#include <memory>
-
-#include "base/metrics/histogram_macros.h"
-#include "base/metrics/histogram_samples.h"
-#include "base/metrics/statistics_recorder.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-using base::HistogramBase;
-using base::HistogramSamples;
-using base::StatisticsRecorder;
-
-namespace chrome_browser_application_mac {
-
-// Generate an NSException with the given name.
-NSException* ExceptionNamed(NSString* name) {
-  return [NSException exceptionWithName:name
-                                 reason:@"No reason given"
-                               userInfo:nil];
-}
-
-// Helper to keep binning expectations readible.
-size_t BinForExceptionNamed(NSString* name) {
-  return BinForException(ExceptionNamed(name));
-}
-
-TEST(ChromeApplicationMacTest, ExceptionBinning) {
-  // These exceptions must be in this order.
-  EXPECT_EQ(BinForExceptionNamed(NSGenericException), 0U);
-  EXPECT_EQ(BinForExceptionNamed(NSRangeException), 1U);
-  EXPECT_EQ(BinForExceptionNamed(NSInvalidArgumentException), 2U);
-  EXPECT_EQ(BinForExceptionNamed(NSMallocException), 3U);
-
-  // Random other exceptions map to |kUnknownNSException|.
-  EXPECT_EQ(BinForExceptionNamed(@"CustomName"), kUnknownNSException);
-  EXPECT_EQ(BinForExceptionNamed(@"Custom Name"), kUnknownNSException);
-  EXPECT_EQ(BinForExceptionNamed(@""), kUnknownNSException);
-  EXPECT_EQ(BinForException(nil), kUnknownNSException);
-}
-
-TEST(ChromeApplicationMacTest, RecordException) {
-  // Start up a histogram recorder.
-  // TODO(rtenneti): Leaks StatisticsRecorder and will update suppressions.
-  base::StatisticsRecorder::Initialize();
-
-  StatisticsRecorder::Histograms histograms;
-  StatisticsRecorder::GetSnapshot("OSX.NSException", &histograms);
-  EXPECT_EQ(0U, histograms.size());
-
-  // Record some known exceptions.
-  RecordExceptionWithUma(ExceptionNamed(NSGenericException));
-  RecordExceptionWithUma(ExceptionNamed(NSGenericException));
-  RecordExceptionWithUma(ExceptionNamed(NSGenericException));
-  RecordExceptionWithUma(ExceptionNamed(NSGenericException));
-  RecordExceptionWithUma(ExceptionNamed(NSRangeException));
-  RecordExceptionWithUma(ExceptionNamed(NSInvalidArgumentException));
-  RecordExceptionWithUma(ExceptionNamed(NSInvalidArgumentException));
-  RecordExceptionWithUma(ExceptionNamed(NSInvalidArgumentException));
-  RecordExceptionWithUma(ExceptionNamed(NSMallocException));
-  RecordExceptionWithUma(ExceptionNamed(NSMallocException));
-
-  // Record some unknown exceptions.
-  RecordExceptionWithUma(ExceptionNamed(@"CustomName"));
-  RecordExceptionWithUma(ExceptionNamed(@"Custom Name"));
-  RecordExceptionWithUma(ExceptionNamed(@""));
-  RecordExceptionWithUma(nil);
-
-  // We should have exactly the right number of exceptions.
-  StatisticsRecorder::GetSnapshot("OSX.NSException", &histograms);
-  EXPECT_EQ(1U, histograms.size());
-  EXPECT_EQ(HistogramBase::kUmaTargetedHistogramFlag, histograms[0]->flags());
-
-  std::unique_ptr<HistogramSamples> samples(histograms[0]->SnapshotSamples());
-  EXPECT_EQ(4, samples->GetCount(0));
-  EXPECT_EQ(1, samples->GetCount(1));
-  EXPECT_EQ(3, samples->GetCount(2));
-  EXPECT_EQ(2, samples->GetCount(3));
-
-  // The unknown exceptions should end up in the overflow bucket.
-  EXPECT_TRUE(histograms[0]->HasConstructionArguments(1,
-                                                      kUnknownNSException,
-                                                      kUnknownNSException + 1));
-  EXPECT_EQ(4, samples->GetCount(kUnknownNSException));
-}
-
-}  // chrome_browser_application_mac