DevTools: Fix for Page.captureScreenshot

content/browser/devtools/renderer_overrides_handler_browsertest.cc

 // Copyright 2013 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.
 
-#include "base/basictypes.h"
+#include "base/base64.h"
+#include "base/command_line.h"
 #include "base/json/json_reader.h"
-#include "base/memory/scoped_ptr.h"
-#include "content/browser/devtools/renderer_overrides_handler.h"
+#include "content/browser/devtools/devtools_protocol.h"
 #include "content/public/browser/devtools_agent_host.h"
+#include "content/public/browser/devtools_client_host.h"
+#include "content/public/browser/devtools_manager.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/test/browser_test_utils.h"
 #include "content/public/test/content_browser_test.h"
-#include "content/public/test/content_browser_test_utils.h"
 #include "content/shell/browser/shell.h"
+#include "third_party/skia/include/core/SkBitmap.h"
+#include "ui/compositor/compositor_switches.h"
+#include "ui/gfx/codec/png_codec.h"
 
 namespace content {
 
-class RendererOverridesHandlerTest : public ContentBrowserTest {
+class RendererOverridesHandlerTest : public ContentBrowserTest,
+                                     public DevToolsClientHost {
  protected:
-  scoped_refptr<DevToolsProtocol::Response> SendCommand(
-      const std::string& method,
-      base::DictionaryValue* params) {
-    scoped_ptr<RendererOverridesHandler> handler(CreateHandler());
-    scoped_refptr<DevToolsProtocol::Command> command(
-        DevToolsProtocol::CreateCommand(1, method, params));
-    return handler->HandleCommand(command);
-  }
-
-  void SendAsyncCommand(const std::string& method,
-                        base::DictionaryValue* params) {
-    scoped_ptr<RendererOverridesHandler> handler(CreateHandler());
-    scoped_refptr<DevToolsProtocol::Command> command(
-        DevToolsProtocol::CreateCommand(1, method, params));
-    scoped_refptr<DevToolsProtocol::Response> response =
-        handler->HandleCommand(command);
-    EXPECT_TRUE(response->is_async_promise());
+  void SendCommand(const std::string& method,
+                   base::DictionaryValue* params) {
+    EXPECT_TRUE(DevToolsManager::GetInstance()->DispatchOnInspectorBackend(this,
+        DevToolsProtocol::CreateCommand(1, method, params)->Serialize()));
     base::MessageLoop::current()->Run();
   }
 
   bool HasValue(const std::string& path) {
     base::Value* value = 0;
     return result_->Get(path, &value);
   }
 
   bool HasListItem(const std::string& path_to_list,
                    const std::string& name,
@@ skipping 11 matching lines @@
         return false;
       if (id == value)
         return true;
     }
     return false;
   }
 
   scoped_ptr<base::DictionaryValue> result_;
 
  private:
-  RendererOverridesHandler* CreateHandler() {
-    RenderViewHost* rvh = shell()->web_contents()->GetRenderViewHost();
-    DevToolsAgentHost* agent = DevToolsAgentHost::GetOrCreateFor(rvh).get();
-    scoped_ptr<RendererOverridesHandler> handler(
-        new RendererOverridesHandler(agent));
-    handler->SetNotifier(base::Bind(
-        &RendererOverridesHandlerTest::OnMessageSent, base::Unretained(this)));
-    return handler.release();
+  void SetUpOnMainThread() {
+    DevToolsManager::GetInstance()->RegisterDevToolsClientHostFor(
+        DevToolsAgentHost::GetOrCreateFor(
+            shell()->web_contents()->GetRenderViewHost()).get(),
+        this);
   }
 
-  void OnMessageSent(const std::string& message) {
+  void TearDownOnMainThread() {
+    DevToolsManager::GetInstance()->ClientHostClosing(this);
+  }
+
+  virtual void DispatchOnInspectorFrontend(
+      const std::string& message) OVERRIDE {
     scoped_ptr<base::DictionaryValue> root(
         static_cast<base::DictionaryValue*>(base::JSONReader::Read(message)));
     base::DictionaryValue* result;
-    root->GetDictionary("result", &result);
+    EXPECT_TRUE(root->GetDictionary("result", &result));
     result_.reset(result->DeepCopy());
     base::MessageLoop::current()->QuitNow();
   }
+
+  virtual void InspectedContentsClosing() OVERRIDE {
+    EXPECT_TRUE(false);
+  }
+
+  virtual void ReplacedWithAnotherClient() OVERRIDE {
+    EXPECT_TRUE(false);
+  }
 };
 
 IN_PROC_BROWSER_TEST_F(RendererOverridesHandlerTest, QueryUsageAndQuota) {
   base::DictionaryValue* params = new base::DictionaryValue();
   params->SetString("securityOrigin", "http://example.com");
-  SendAsyncCommand("Page.queryUsageAndQuota", params);
+  SendCommand("Page.queryUsageAndQuota", params);
 
   EXPECT_TRUE(HasValue("quota.persistent"));
   EXPECT_TRUE(HasValue("quota.temporary"));
   EXPECT_TRUE(HasListItem("usage.temporary", "id", "appcache"));
   EXPECT_TRUE(HasListItem("usage.temporary", "id", "database"));
   EXPECT_TRUE(HasListItem("usage.temporary", "id", "indexeddatabase"));
   EXPECT_TRUE(HasListItem("usage.temporary", "id", "filesystem"));
   EXPECT_TRUE(HasListItem("usage.persistent", "id", "filesystem"));
 }
 
+class CaptureScreenshotTest : public RendererOverridesHandlerTest {
+ private:
+  void SetUpCommandLine(base::CommandLine* command_line) OVERRIDE {
+    command_line->AppendSwitch(switches::kEnablePixelOutputInTests);
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(CaptureScreenshotTest, CaptureScreenshot) {
+  shell()->LoadURL(GURL("about:blank"));
+  EXPECT_TRUE(content::ExecuteScript(

[Vladislav Kaznacheev, 2014/06/16 08:25:27]

Does this test fail with the old implementation of Page.CaptureScreenshot? In
the original patch the test did 50 iterations and it made sense since the whole
thing is a bit non-deterministic.

[vkuzkokov, 2014/06/16 10:01:24]

The same test with old implementation fails for me consistently.
50 iterations take 31s (9s with --enable-gpu) which I think is too much for just
one test.

+      shell()->web_contents()->GetRenderViewHost(),
+      "document.body.style.background = '#123456'"));
+  SendCommand("Page.captureScreenshot", new base::DictionaryValue());
+  std::string base64;
+  EXPECT_TRUE(result_->GetString("data", &base64));
+  std::string png;
+  EXPECT_TRUE(base::Base64Decode(base64, &png));
+  SkBitmap bitmap;
+  gfx::PNGCodec::Decode(reinterpret_cast<const unsigned char*>(png.data()),
+                        png.size(), &bitmap);
+  SkColor color(bitmap.getColor(0, 0));
+  EXPECT_EQ(0x12U, SkColorGetR(color));
+  EXPECT_EQ(0x34U, SkColorGetG(color));
+  EXPECT_EQ(0x56U, SkColorGetB(color));
+}
+
 }  // namespace content