Bug 1061846 - Add constants for transaction delay indicator. r=milan

--HG--
extra : rebase_source : 7176c689bd00e90590cc021ab35189720019c73e

gfx/layers/composite/LayerManagerComposite.cpp

@@ -351,8 +351,7 @@ LayerManagerComposite::RenderDebugOverlay(const Rect& aBounds)
     int width;
     int border;
     float alpha = 1;
-    if ((now - mWarnTime).ToMilliseconds() < 150) {
-      printf_stderr("Draw\n");
+    if ((now - mWarnTime).ToMilliseconds() < kVisualWarningDuration) {
       EffectChain effects;
 
       // Black blorder

gfx/layers/composite/LayerManagerComposite.h

@@ -67,6 +67,10 @@ class TextRenderer;
 class CompositingRenderTarget;
 struct FPSState;
 
+static const int kVisualWarningTrigger = 200; // ms
+static const int kVisualWarningMax = 1000; // ms
+static const int kVisualWarningDuration = 150; // ms
+
 class LayerManagerComposite MOZ_FINAL : public LayerManager
 {
   typedef mozilla::gfx::DrawTarget DrawTarget;
@@ -247,7 +251,7 @@ public:
     mozilla::TimeStamp now = TimeStamp::Now();
     if (mWarnTime.IsNull() ||
         severity > mWarningLevel ||
-        mWarnTime + TimeDuration::FromMilliseconds(150) < now) {
+        mWarnTime + TimeDuration::FromMilliseconds(kVisualWarningDuration) < now) {
       mWarnTime = now;
       mWarningLevel = severity;
     }

gfx/layers/ipc/LayerTransactionParent.cpp

@@ -571,8 +571,9 @@ LayerTransactionParent::RecvUpdate(const InfallibleTArray<Edit>& cset,
 
   TimeDuration latency = TimeStamp::Now() - aTransactionStart;
   // Theshold is 200ms to trigger, 1000ms to hit red
-  if (latency > TimeDuration::FromMilliseconds(200)) {
-    float severity = (latency - TimeDuration::FromMilliseconds(200)).ToMilliseconds() / 800;
+  if (latency > TimeDuration::FromMilliseconds(kVisualWarningTrigger)) {
+    float severity = (latency - TimeDuration::FromMilliseconds(kVisualWarningTrigger)).ToMilliseconds() /
+                       (kVisualWarningMax - kVisualWarningTrigger);
     if (severity > 1.f) {
       severity = 1.f;
     }