Enhance and refactor ChromeDriver's capability handling. Log warning for

chrome/test/webdriver/webdriver_util.h

Index: chrome/test/webdriver/webdriver_util.h
diff --git a/chrome/test/webdriver/webdriver_util.h b/chrome/test/webdriver/webdriver_util.h
index e36bdb733da438e92afdf4bb7e48472670397895..c512ba50370303b0a3ae675d7b6d75476bed12cd 100644
--- a/chrome/test/webdriver/webdriver_util.h
+++ b/chrome/test/webdriver/webdriver_util.h
@@ -11,14 +11,11 @@
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/values.h"
 #include "chrome/test/automation/value_conversion_traits.h"
 
 class FilePath;
 
-namespace base {
-class Value;
-}
-
 namespace webdriver {
 
 // Generates a random, 32-character hexidecimal ID.
@@ -27,6 +24,13 @@ std::string GenerateRandomID();
 // Returns the equivalent JSON string for the given value.
 std::string JsonStringify(const base::Value* value);
 
+// Returns the JSON string for the given value, with the exception that
+// long strings are shortened for easier display.
+std::string JsonStringifyForDisplay(const base::Value* value);
+
+// Returns the string representation of the given type, for display purposes.
+const char* GetJsonTypeName(base::Value::Type type);
+
 #if defined(OS_MACOSX)
 // Gets the paths to the user and local application directory.
 void GetApplicationDirs(std::vector<FilePath>* app_dirs);