Fix -Wshorten-64-to-32 warnings in ui/base.

../../ui/base/test/ui_controls_internal_win.cc(204,9):  warning: implicit conversion loses integer precision: 'WPARAM' (aka 'unsigned long long') to 'UINT' (aka 'unsigned int') [-Wshorten-64-to-32]
        w_param, reinterpret_cast<MOUSEHOOKSTRUCT*>(l_param));
        ^~~~~~~
../../ui/base/test/ui_controls_internal_win.cc(405,25):  warning: implicit conversion loses integer precision: 'std::vector<tagINPUT, std::allocator<tagINPUT> >::size_type' (aka 'unsigned long long') to 'UINT' (aka 'unsigned int') [-Wshorten-64-to-32]
  if (::SendInput(input.size(), input.data(), sizeof(INPUT)) != input.size())
      ~~          ~~~~~~^~~~~~
../../ui/base/test/ui_controls_internal_win.cc(520,25):  warning: implicit conversion loses integer precision: 'std::vector<tagINPUT, std::allocator<tagINPUT> >::size_type' (aka 'unsigned long long') to 'UINT' (aka 'unsigned int') [-Wshorten-64-to-32]
  if (::SendInput(input.size(), input.data(), sizeof(INPUT)) != input.size())
      ~~          ~~~~~~^~~~~~

BUG=879657

Change-Id: Iea866217701ef4b9f67b63a58a6ab6a35a88b1a8
Reviewed-on: https://chromium-review.googlesource.com/1217848
Commit-Queue: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590471}

ui/base/test/ui_controls_internal_win.cc

@@ -201,7 +201,8 @@ LRESULT CALLBACK InputDispatcher::MouseHook(int n_code,
   if (n_code == HC_ACTION) {
     DCHECK(current_dispatcher_);
     current_dispatcher_->DispatchedMessage(
-        w_param, reinterpret_cast<MOUSEHOOKSTRUCT*>(l_param));
+        static_cast<UINT>(w_param),
+        reinterpret_cast<MOUSEHOOKSTRUCT*>(l_param));
   }
   return CallNextHookEx(next_hook, n_code, w_param, l_param);
 }
@@ -402,9 +403,14 @@ bool SendKeyPressImpl(HWND window,
   AppendKeyboardInput(key, true, &input);
   AppendAcceleratorInputs(control, shift, alt, true, &input);
 
-  if (::SendInput(input.size(), input.data(), sizeof(INPUT)) != input.size())
+  if (input.size() > std::numeric_limits<UINT>::max())
     return false;
 
+  if (::SendInput(static_cast<UINT>(input.size()), input.data(),
+                  sizeof(INPUT)) != input.size()) {
+    return false;
+  }
+
   if (dispatcher)
     dispatcher->AddRef();
 
@@ -517,9 +523,14 @@ bool SendMouseEventsImpl(MouseButton type,
                             accelerator_state & kAlt, true, &input);
   }
 
-  if (::SendInput(input.size(), input.data(), sizeof(INPUT)) != input.size())
+  if (input.size() > std::numeric_limits<UINT>::max())
     return false;
 
+  if (::SendInput(static_cast<UINT>(input.size()), input.data(),
+                  sizeof(INPUT)) != input.size()) {
+    return false;
+  }
+
   if (dispatcher)
     dispatcher->AddRef();