Reland: cc: Fix size_t to int truncations in layers/ output/ playback/ quads/

cc/output/direct_renderer.cc

Index: cc/output/direct_renderer.cc
diff --git a/cc/output/direct_renderer.cc b/cc/output/direct_renderer.cc
index 39158169b2092597736782dc7355e14d01d7840d..23801dba926c6c36739b936a3de3d265d1ab8a58 100644
--- a/cc/output/direct_renderer.cc
+++ b/cc/output/direct_renderer.cc
@@ -10,6 +10,7 @@
 #include "base/containers/hash_tables.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/metrics/histogram.h"
+#include "base/numerics/safe_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/base/math_util.h"
 #include "cc/output/bsp_tree.h"
@@ -193,8 +194,9 @@ void DirectRenderer::DrawFrame(RenderPassList* render_passes_in_draw_order,
                                const gfx::Rect& device_clip_rect,
                                bool disable_picture_quad_image_filtering) {
   TRACE_EVENT0("cc", "DirectRenderer::DrawFrame");
-  UMA_HISTOGRAM_COUNTS("Renderer4.renderPassCount",
-                       render_passes_in_draw_order->size());
+  UMA_HISTOGRAM_COUNTS(
+      "Renderer4.renderPassCount",
+      base::saturated_cast<int>(render_passes_in_draw_order->size()));
 
   const RenderPass* root_render_pass = render_passes_in_draw_order->back();
   DCHECK(root_render_pass);