[Blimp] Adds Blimp EngineSession and ClientSession skeleton

blimp/engine/ui/blimp_screen.cc

Index: blimp/engine/ui/blimp_screen.cc
diff --git a/blimp/engine/ui/blimp_screen.cc b/blimp/engine/ui/blimp_screen.cc
index 2eba20f37b035f8fa9b71a6f0ac17ab12c5209eb..02829679a4474c54ea925f856996024ed7c814cd 100644
--- a/blimp/engine/ui/blimp_screen.cc
+++ b/blimp/engine/ui/blimp_screen.cc
@@ -10,13 +10,14 @@ namespace engine {
 namespace {
 
 const int64 kDisplayId = 1;
-const int kDefaultDisplayWidth = 1;
-const int kDefaultDisplayHeight = 1;
 const float kDefaultScale = 1.0f;
 const int kNumDisplays = 1;
 
 }  // namespace
 
+const int BlimpScreen::kDefaultDisplayWidth = 800;
+const int BlimpScreen::kDefaultDisplayHeight = 600;
+
 BlimpScreen::BlimpScreen() : display_(kDisplayId) {
   display_.SetScaleAndBounds(
       kDefaultScale, gfx::Rect(kDefaultDisplayWidth, kDefaultDisplayHeight));