telemetry: Use trace categories to configure synthetic delays

tools/perf/page_sets/tough_scheduling_cases.json

 {
   "description": "Tough scheduler latency test cases",
   "smoothness": {
     "action": "scroll"
   },
   "pages": [
     {
       "url": "file://tough_scheduling_cases/simple_text_page.html",
-      "why": "Simple scrolling baseline",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays" }
-      ]
+      "why": "Simple scrolling baseline"
     },
     {
       "url": "file://tough_scheduling_cases/simple_text_page.html?main_busy",
       "why": "Simulate oversubscribed main thread",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "cc.BeginMainFrame": { "target_duration": 0.008 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "cc.BeginMainFrame": { "target_duration": 0.008 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/simple_text_page.html?main_very_busy",
       "why": "Simulate oversubscribed main thread",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "cc.BeginMainFrame": { "target_duration": 0.024 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "cc.BeginMainFrame": { "target_duration": 0.024 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/simple_text_page.html?medium_layers",
       "why": "Simulate a page with a a few graphics layers",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "cc.BeginMainFrame": { "target_duration": 0.004 },
-            "cc.DrawAndSwap": { "target_duration": 0.004 },
-            "gpu.SwapBuffers": { "target_duration": 0.004 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "cc.BeginMainFrame": { "target_duration": 0.004 },
+        "cc.DrawAndSwap": { "target_duration": 0.004 },
+        "gpu.SwapBuffers": { "target_duration": 0.004 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/simple_text_page.html?many_layers",
       "why": "Simulate a page with many graphics layers",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "cc.BeginMainFrame": { "target_duration": 0.012 },
-            "cc.DrawAndSwap": { "target_duration": 0.012 },
-            "gpu.SwapBuffers": { "target_duration": 0.012 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "cc.BeginMainFrame": { "target_duration": 0.012 },
+        "cc.DrawAndSwap": { "target_duration": 0.012 },
+        "gpu.SwapBuffers": { "target_duration": 0.012 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/simple_text_page.html?medium_raster",
       "why": "Simulate a page with expensive recording and rasterization",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "cc.BeginMainFrame": { "target_duration": 0.004 },
-            "cc.RasterRequiredForActivation": { "target_duration": 0.004 },
-            "gpu.AsyncTexImage": { "target_duration": 0.004 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "cc.BeginMainFrame": { "target_duration": 0.004 },
+        "cc.RasterRequiredForActivation": { "target_duration": 0.004 },
+        "gpu.AsyncTexImage": { "target_duration": 0.004 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/simple_text_page.html?heavy_raster",
       "why": "Simulate a page with expensive recording and rasterization",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "cc.BeginMainFrame": { "target_duration": 0.024 },
-            "cc.RasterRequiredForActivation": { "target_duration": 0.024 },
-            "gpu.AsyncTexImage": { "target_duration": 0.024 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "cc.BeginMainFrame": { "target_duration": 0.024 },
+        "cc.RasterRequiredForActivation": { "target_duration": 0.024 },
+        "gpu.AsyncTexImage": { "target_duration": 0.024 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/touch_handler_scrolling.html",
-      "why": "Touch handler scrolling baseline",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays" }
-      ]
+      "why": "Touch handler scrolling baseline"
     },
     {
       "url": "file://tough_scheduling_cases/touch_handler_scrolling.html?medium_handler",
       "why": "Medium cost touch handler",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "blink.HandleInputEvent": { "target_duration": 0.008 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "blink.HandleInputEvent": { "target_duration": 0.008 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/touch_handler_scrolling.html?slow_handler",
       "why": "Slow touch handler",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "blink.HandleInputEvent": { "target_duration": 0.024 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "blink.HandleInputEvent": { "target_duration": 0.024 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/touch_handler_scrolling.html?janky_handler",
       "why": "Touch handler that often takes a long time",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "blink.HandleInputEvent": { "target_duration": 0.024, "mode": "alternating" }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "blink.HandleInputEvent": { "target_duration": 0.024, "mode": "alternating" }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/touch_handler_scrolling.html?occasionally_janky_handler",
       "why": "Touch handler that occasionally takes a long time",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "blink.HandleInputEvent": { "target_duration": 0.024, "mode": "oneshot" }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "blink.HandleInputEvent": { "target_duration": 0.024, "mode": "oneshot" }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/touch_handler_scrolling.html?super_slow_handler",
       "why": "Super expensive touch handler causes browser to scroll after a timeout",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "blink.HandleInputEvent": { "target_duration": 0.2 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "blink.HandleInputEvent": { "target_duration": 0.2 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/div_touch_handler.html",
       "why": "Super expensive touch handler that only occupies a part of the page",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "blink.HandleInputEvent": { "target_duration": 0.2 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "blink.HandleInputEvent": { "target_duration": 0.2 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/raf.html",
-      "why": "requestAnimationFrame scrolling baseline",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays" }
-      ]
+      "why": "requestAnimationFrame scrolling baseline"
     },
     {
       "url": "file://tough_scheduling_cases/raf_canvas.html",
-      "why": "Test canvas blocking behavior",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays" }
-      ]
+      "why": "Test canvas blocking behavior"
     },
     {
       "url": "file://tough_scheduling_cases/raf.html?medium_handler",
       "why": "Test a moderately heavy requestAnimationFrame handler",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "cc.BeginMainFrame": { "target_duration": 0.004 },
-            "cc.RasterRequiredForActivation": { "target_duration": 0.004 },
-            "gpu.AsyncTexImage": { "target_duration": 0.004 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "cc.BeginMainFrame": { "target_duration": 0.004 },
+        "cc.RasterRequiredForActivation": { "target_duration": 0.004 },
+        "gpu.AsyncTexImage": { "target_duration": 0.004 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/raf.html?heavy_handler",
       "why": "Test a moderately heavy requestAnimationFrame handler",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "cc.BeginMainFrame": { "target_duration": 0.024 },
-            "cc.RasterRequiredForActivation": { "target_duration": 0.024 },
-            "gpu.AsyncTexImage": { "target_duration": 0.024 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "cc.BeginMainFrame": { "target_duration": 0.024 },
+        "cc.RasterRequiredForActivation": { "target_duration": 0.024 },
+        "gpu.AsyncTexImage": { "target_duration": 0.024 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/raf.html?gpu_bound",
       "why": "Simulate a heavily GPU bound page",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "gpu.SwapBuffers": { "target_duration": 0.1 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "gpu.SwapBuffers": { "target_duration": 0.1 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/raf_touch_animation.html",
-      "why": "Stress test for the scheduler",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays" }
-      ]
+      "why": "Stress test for the scheduler"
     },
     {
       "url": "file://tough_scheduling_cases/raf_touch_animation.html?medium",
       "why": "Medium stress test for the scheduler",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "cc.BeginMainFrame": { "target_duration": 0.004 },
-            "cc.DrawAndSwap": { "target_duration": 0.004 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "cc.BeginMainFrame": { "target_duration": 0.004 },
+        "cc.DrawAndSwap": { "target_duration": 0.004 }
+      }
     },
     {
       "url": "file://tough_scheduling_cases/raf_touch_animation.html?heavy",
       "why": "Heavy stress test for the scheduler",
-      "navigate_steps": [
-        { "action": "navigate" },
-        { "action": "set_synthetic_delays",
-          "delays": {
-            "cc.BeginMainFrame": { "target_duration": 0.012 },
-            "cc.DrawAndSwap": { "target_duration": 0.012 }
-          }
-        }
-      ]
+      "synthetic_delays": {
+        "cc.BeginMainFrame": { "target_duration": 0.012 },
+        "cc.DrawAndSwap": { "target_duration": 0.012 }
+      }
     }
   ]
 }