Force-enable the software keyboard when running tests in iOS simulator.

Xcode 6 introduced behavior in the iOS Simulator where the software
keyboard does not appear if a hardware keyboard is connected.

This CL enables the software keyboard when a gtest app starts up.

BUG=392433

Review URL: https://codereview.chromium.org/514223002

Cr-Commit-Position: refs/heads/master@{#292916}

base/test/test_support_ios.mm

@@ -34,6 +34,17 @@ static char** g_argv;
 - (void) _terminateWithStatus:(int)status;
 @end
 
+#ifdef TARGET_IPHONE_SIMULATOR
+// Xcode 6 introduced behavior in the iOS Simulator where the software
+// keyboard does not appear if a hardware keyboard is connected. The following
+// declaration allows this behavior to be overriden when the app starts up.
+@interface UIKeyboardImpl
++ (instancetype)sharedInstance;
+- (void)setAutomaticMinimizationEnabled:(BOOL)enabled;
+- (void)setSoftwareKeyboardShownByTouch:(BOOL)enabled;
+@end
+#endif  // TARGET_IPHONE_SIMULATOR
+
 @interface ChromeUnitTestDelegate : NSObject {
  @private
   base::scoped_nsobject<UIWindow> window_;
@@ -46,6 +57,15 @@ static char** g_argv;
 - (BOOL)application:(UIApplication *)application
     didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 
+#ifdef TARGET_IPHONE_SIMULATOR
+  // Xcode 6 introduced behavior in the iOS Simulator where the software
+  // keyboard does not appear if a hardware keyboard is connected. The following
+  // calls override this behavior by ensuring that the software keyboard is
+  // always shown.
+  [[UIKeyboardImpl sharedInstance] setAutomaticMinimizationEnabled:NO];
+  [[UIKeyboardImpl sharedInstance] setSoftwareKeyboardShownByTouch:YES];
+#endif  // TARGET_IPHONE_SIMULATOR
+
   CGRect bounds = [[UIScreen mainScreen] bounds];
 
   // Yes, this is leaked, it's just to make what's running visible.