Add a TestBrowserDialog helper class for testing browser dialogs in a consistent way.

base/test/test_timeouts.cc

Index: base/test/test_timeouts.cc
diff --git a/base/test/test_timeouts.cc b/base/test/test_timeouts.cc
index 55e9a798613404610c2de68442af2f5911e1d3e0..0dc0f49deeb225dcc9f9cf8ed8c5f773d93d5f70 100644
--- a/base/test/test_timeouts.cc
+++ b/base/test/test_timeouts.cc
@@ -46,7 +46,10 @@ void InitializeTimeout(const char* switch_name, int min_value, int* value) {
     std::string string_value(base::CommandLine::ForCurrentProcess()->
          GetSwitchValueASCII(switch_name));
     int timeout;
-    base::StringToInt(string_value, &timeout);
+    if (string_value == TestTimeouts::kNoTimeoutSwitchValue)
+      timeout = kAlmostInfiniteTimeoutMs;
+    else
+      base::StringToInt(string_value, &timeout);
     *value = std::max(*value, timeout);
   }
   *value *= kTimeoutMultiplier;
@@ -65,6 +68,9 @@ void InitializeTimeout(const char* switch_name, int* value) {
 }  // namespace
 
 // static
+constexpr const char TestTimeouts::kNoTimeoutSwitchValue[];
+
+// static
 bool TestTimeouts::initialized_ = false;
 
 // The timeout values should increase in the order they appear in this block.