Support device-pixel-ratio in wpt reftests.

tests/wpt/harness/wptrunner/executors/base.py

@@ -206,12 +206,12 @@ class RefTestImplementation(object):
     def logger(self):
         return self.executor.logger
 
-    def get_hash(self, test, viewport_size):
+    def get_hash(self, test, viewport_size, dpi):
         timeout = test.timeout * self.timeout_multiplier
-        key = (test.url, viewport_size)
+        key = (test.url, viewport_size, dpi)
 
         if key not in self.screenshot_cache:
-            success, data = self.executor.screenshot(test, viewport_size)
+            success, data = self.executor.screenshot(test, viewport_size, dpi)
 
             if not success:
                 return False, data
@@ -236,6 +236,7 @@ class RefTestImplementation(object):
 
     def run_test(self, test):
         viewport_size = test.viewport_size
+        dpi = test.dpi
         self.message = []
 
         # Depth-first search of reference tree, with the goal
@@ -249,7 +250,7 @@ class RefTestImplementation(object):
             nodes, relation = stack.pop()
 
             for i, node in enumerate(nodes):
-                success, data = self.get_hash(node, viewport_size)
+                success, data = self.get_hash(node, viewport_size, dpi)
                 if success is False:
                     return {"status": data[0], "message": data[1]}
 
@@ -266,7 +267,7 @@ class RefTestImplementation(object):
 
         for i, (node, screenshot) in enumerate(zip(nodes, screenshots)):
             if screenshot is None:
-                success, screenshot = self.retake_screenshot(node, viewport_size)
+                success, screenshot = self.retake_screenshot(node, viewport_size, dpi)
                 if success:
                     screenshots[i] = screenshot
 
@@ -277,12 +278,12 @@ class RefTestImplementation(object):
                 "message": "\n".join(self.message),
                 "extra": {"reftest_screenshots": log_data}}
 
-    def retake_screenshot(self, node, viewport_size):
-        success, data = self.executor.screenshot(node, viewport_size)
+    def retake_screenshot(self, node, viewport_size, dpi):
+        success, data = self.executor.screenshot(node, viewport_size, dpi)
         if not success:
             return False, data
 
-        key = (node.url, viewport_size)
+        key = (node.url, viewport_size, dpi)
         hash_val, _ = self.screenshot_cache[key]
         self.screenshot_cache[key] = hash_val, data
         return True, data

tests/wpt/harness/wptrunner/executors/executormarionette.py

@@ -385,9 +385,10 @@ class MarionetteRefTestExecutor(RefTestExecutor):
 
         return self.convert_result(test, result)
 
-    def screenshot(self, test, viewport_size):
+    def screenshot(self, test, viewport_size, dpi):
         # https://github.com/w3c/wptrunner/issues/166
         assert viewport_size is None
+        assert dpi is None
 
         timeout =  self.timeout_multiplier * test.timeout if self.debug_info is None else None
 

tests/wpt/harness/wptrunner/executors/executorselenium.py

@@ -247,9 +247,10 @@ class SeleniumRefTestExecutor(RefTestExecutor):
 
         return self.convert_result(test, result)
 
-    def screenshot(self, test, viewport_size):
+    def screenshot(self, test, viewport_size, dpi):
         # https://github.com/w3c/wptrunner/issues/166
         assert viewport_size is None
+        assert dpi is None
 
         return SeleniumRun(self._screenshot,
                            self.protocol.webdriver,

tests/wpt/harness/wptrunner/executors/executorservo.py

@@ -196,7 +196,7 @@ class ServoRefTestExecutor(ProcessTestExecutor):
         os.rmdir(self.tempdir)
         ProcessTestExecutor.teardown(self)
 
-    def screenshot(self, test, viewport_size):
+    def screenshot(self, test, viewport_size, dpi):
         full_url = self.test_url(test)
 
         with TempFilename(self.tempdir) as output_path:
@@ -216,6 +216,9 @@ class ServoRefTestExecutor(ProcessTestExecutor):
             if viewport_size:
                 command += ["--resolution", viewport_size]
 
+            if dpi:
+                command += ["--device-pixel-ratio", dpi]
+
             self.command = debug_args + command
 
             env = os.environ.copy()

tests/wpt/harness/wptrunner/executors/executorservodriver.py

@@ -226,9 +226,10 @@ class ServoWebDriverRefTestExecutor(RefTestExecutor):
             message += traceback.format_exc(e)
             return test.result_cls("ERROR", message), []
 
-    def screenshot(self, test, viewport_size):
+    def screenshot(self, test, viewport_size, dpi):
         # https://github.com/w3c/wptrunner/issues/166
         assert viewport_size is None
+        assert dpi is None
 
         timeout = (test.timeout * self.timeout_multiplier + extra_timeout
                    if self.debug_info is None else None)

tests/wpt/harness/wptrunner/wpttest.py

@@ -216,7 +216,7 @@ class ReftestTest(Test):
 
     def __init__(self, url, inherit_metadata, test_metadata, references,
                  timeout=DEFAULT_TIMEOUT, path=None, viewport_size=None,
-                 protocol="http"):
+                 dpi=None, protocol="http"):
         Test.__init__(self, url, inherit_metadata, test_metadata, timeout, path, protocol)
 
         for _, ref_type in references:
@@ -225,6 +225,7 @@ class ReftestTest(Test):
 
         self.references = references
         self.viewport_size = viewport_size
+        self.dpi = dpi
 
     @classmethod
     def from_manifest(cls,
@@ -250,6 +251,7 @@ class ReftestTest(Test):
                    timeout=timeout,
                    path=manifest_test.path,
                    viewport_size=manifest_test.viewport_size,
+                   dpi=manifest_test.dpi,
                    protocol="https" if hasattr(manifest_test, "https") and manifest_test.https else "http")
 
         nodes[url] = node