[chromedriver] Prevent GetLog from returning more than 100,000 at a time.

chrome/test/chromedriver/logging_unittest.cc

Index: chrome/test/chromedriver/logging_unittest.cc
diff --git a/chrome/test/chromedriver/logging_unittest.cc b/chrome/test/chromedriver/logging_unittest.cc
index 47d0f470f0143da4331292e0b2fca27f56b0cedc..d0ef82b8af195d96a26861f51bf812c0dfbe0dbc 100644
--- a/chrome/test/chromedriver/logging_unittest.cc
+++ b/chrome/test/chromedriver/logging_unittest.cc
@@ -168,3 +168,16 @@ TEST(Logging, GetFirstErrorMessage) {
   entry = log.GetFirstErrorMessage();
   ASSERT_EQ("first error message", entry);
 }
+
+TEST(Logging, GetLotsOfLogs) {
+  WebDriverLog log(WebDriverLog::kBrowserType, Log::kAll);
+  std::string entry;
+  for (size_t i = 0; i < WebDriverLog::kMaxReturnedEntries + 1; i++)
+    log.AddEntry(Log::kError, "info message");
+  std::unique_ptr<base::ListValue> entries = log.GetAndClearEntries();
+  ASSERT_EQ(WebDriverLog::kMaxReturnedEntries, entries->GetSize());
+  entries = log.GetAndClearEntries();
+  ASSERT_EQ(1u, entries->GetSize());
+  entries = log.GetAndClearEntries();
+  ASSERT_EQ(0u, entries->GetSize());
+}