Add page.CanRunOnBrowser. Add WebGL check for tough_webgl_cases pages

tools/telemetry/telemetry/core/browser_info.py

Index: tools/telemetry/telemetry/core/browser_info.py
diff --git a/tools/telemetry/telemetry/core/browser_info.py b/tools/telemetry/telemetry/core/browser_info.py
new file mode 100644
index 0000000000000000000000000000000000000000..2e4cf49df4007624dc5c243ed0fcac774e54310f
--- /dev/null
+++ b/tools/telemetry/telemetry/core/browser_info.py
@@ -0,0 +1,38 @@
+# Copyright (c) 2014 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.
+
+_check_webgl_supported_script = """
+(function () {
+  var c = document.createElement('canvas');
+  var gl = c.getContext('webgl');
+  if (gl == null) {
+    gl = c.getContext("experimental-webgl");
+    if (gl == null) {
+      return false;
+    }
+  }
+  return true;
+})();
+"""
+
+class BrowserInfo(object):
+  """A wrapper around browser object that allows looking up infos of the
+  browser.
+  """
+  def __init__(self, browser):
+    self._browser = browser
+
+  def HasWebGLSupport(self):
+    result = False
+    # If no tab is opened, open one and close it after evaluate
+    # _check_webgl_supported_script
+    if len(self._browser.tabs) == 0 and self._browser.supports_tab_control:
+      self._browser.tabs.New()
+      tab = self._browser.tabs[0]
+      result = tab.EvaluateJavaScript(_check_webgl_supported_script)
+      tab.Close()
+    elif len(self._browser.tabs) > 0:
+      tab = self._browser.tabs[0]
+      result = tab.EvaluateJavaScript(_check_webgl_supported_script)
+    return result