Switch cc::RenderPassId and cc::DrawQuad::Resources to use uint32_t instead of size_t.

cc/quads/render_pass_id.h

Index: cc/quads/render_pass_id.h
diff --git a/cc/quads/render_pass_id.h b/cc/quads/render_pass_id.h
index a0d48ea82d39288cc0586b6d472c0e4074d9d190..68a2051df21c39e9904a984068f7604f6378c489 100644
--- a/cc/quads/render_pass_id.h
+++ b/cc/quads/render_pass_id.h
@@ -6,6 +6,7 @@
 #define CC_QUADS_RENDER_PASS_ID_H_
 
 #include <stddef.h>
+#include <stdint.h>
 
 #include <tuple>
 
@@ -17,10 +18,11 @@ namespace cc {
 class CC_EXPORT RenderPassId {
  public:
   int layer_id;
-  size_t index;
+  uint32_t index;
 
   RenderPassId() : layer_id(-1), index(0) {}
-  RenderPassId(int layer_id, size_t index) : layer_id(layer_id), index(index) {}
+  RenderPassId(int layer_id, uint32_t index)
+      : layer_id(layer_id), index(index) {}
   void* AsTracingId() const;
 
   bool IsValid() const { return layer_id >= 0; }