Added telemetry pages for the canvas element.

tools/perf/page_sets/tough_canvas_cases/rendering_throughput/bouncing_gradient_circles.js

Index: tools/perf/page_sets/tough_canvas_cases/rendering_throughput/bouncing_gradient_circles.js
diff --git a/tools/perf/page_sets/tough_canvas_cases/rendering_throughput/bouncing_gradient_circles.js b/tools/perf/page_sets/tough_canvas_cases/rendering_throughput/bouncing_gradient_circles.js
new file mode 100644
index 0000000000000000000000000000000000000000..1f5d33d1477a65da5cd11bb28f5ee3a5c8d96fca
--- /dev/null
+++ b/tools/perf/page_sets/tough_canvas_cases/rendering_throughput/bouncing_gradient_circles.js
@@ -0,0 +1,113 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+// This code in inspired by the bouncing gradient circles test on the animometer
+// benchmark (https://trac.webkit.org/export/HEAD/trunk/PerformanceTests/Animometer/developer.html).
+// Javascript code:
+//  - https://trac.webkit.org/export/HEAD/trunk/PerformanceTests/Animometer/tests/bouncing-particles/resources/bouncing-particles.js
+//  - https://trac.webkit.org/export/HEAD/trunk/PerformanceTests/Animometer/tests/bouncing-particles/resources/bouncing-canvas-particles.js
+//  - https://trac.webkit.org/export/HEAD/trunk/PerformanceTests/Animometer/tests/bouncing-particles/resources/bouncing-canvas-shapes.js
+
+function BouncingGradientCircle(canvas_width, canvas_height, x_init,
+                             y_init, velocity, size) {
+  this.canvas_width = canvas_width;
+  this.canvas_height = canvas_height;
+  this.x_position = x_init;
+  this.y_position = y_init;
+  this.velocity = velocity; // [speed in x, speed in y] in pixels/second
+  this.color1 = get_random_color_string();
+  this.color2 = get_random_color_string();
+  this.size = size;
+  this.last_time = Date.now();
+
+  this.move = function() {
+    var now = Date.now();
+    var time_interval = (now - this.last_time) / 1000;
+    this.last_time = now;
+
+    // translate & bounce
+    if (this.x_position < 0) {
+      this.x_position = 0;
+      this.velocity[0] = - this.velocity[0];
+    }
+
+    if (this.y_position < 0) {
+      this.y_position = 0;
+      this.velocity[1] = - this.velocity[1];
+    }
+
+    if (this.x_position + this.size > this.canvas_width) {
+      this.x_position = this.canvas_width - this.size;
+      this.velocity[0] = - this.velocity[0];
+    }
+
+    if (this.y_position + this.size > this.canvas_height) {
+      this.y_position = this.canvas_height - this.size;
+      this.velocity[1] = - this.velocity[1];
+    }
+
+    this.x_position += this.velocity[0] * time_interval;
+    this.y_position += this.velocity[1] * time_interval;
+  }
+
+  this.draw = function(context) {
+    this.move();
+
+    // create gradient
+    var gradient = context.createLinearGradient(this.x_position,
+                                                this.y_position,
+                                                this.x_position + this.size,
+                                                this.y_position + this.size);
+    gradient.addColorStop(0, this.color1);
+    gradient.addColorStop(1, this.color2);
+
+    // draw rectangle
+    context.fillStyle = gradient;
+    context.beginPath();
+    context.arc(this.x_position + this.size/2, this.y_position + this.size/2,
+                this.size/2, 0, Math.PI*2, true);
+    context.fill();
+  }
+}
+
+var stage_gradient_circles = (function() {
+  var initialized_shapes;
+  var width;
+  var height;
+
+  var stage = {};
+
+  stage.init = function(number_shapes, canvas_width, canvas_height) {
+    width = canvas_width;
+    height = canvas_height;
+    initialized_shapes = [];
+
+    for(var i = 0; i < number_shapes; i++) {
+      var size = 80;
+
+      var speed = 50;
+      var speed_x = rand_sgn(Math.random() * speed);
+      var speed_y = rand_sgn(Math.sqrt(speed*speed - speed_x*speed_x));
+      var velocity = [speed_x, speed_y];
+
+      var x_init = Math.floor(Math.random() * (canvas_width - size));
+      var y_init = Math.floor(Math.random() * (canvas_height - size));
+
+      var new_shape = new BouncingGradientCircle(canvas_width, canvas_height,
+                                                 x_init, y_init, velocity,
+                                                 size);
+      initialized_shapes.push(new_shape);
+    }
+
+  };
+
+  stage.draw = function(context) {
+    for(var i = 0; i < initialized_shapes.length; i++) {
+      initialized_shapes[i].draw(context);
+    }
+  };
+
+  return stage;
+})();
+
+