Added a test that currently is able to print to pdf.

chrome/browser/printing/print_preview_pdf_generated_browsertest.cc

+// Copyright 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.
+
+#include <cstdio>
+#include <iostream>
+#include <iterator>
+#include <limits>
+#include <string>
+#include <utility>
+#include <vector>
+
+#include "base/file_util.h"
+#include "base/files/file.h"
+#include "base/files/file_path.h"
+#include "base/files/scoped_temp_dir.h"
+#include "base/format_macros.h"
+#include "base/logging.h"
+#include "base/md5.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/numerics/safe_conversions.h"
+#include "base/path_service.h"
+#include "base/run_loop.h"
+#include "base/scoped_native_library.h"
+#include "base/strings/string16.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/app/chrome_command_ids.h"
+#include "chrome/browser/net/referrer.h"
+#include "chrome/browser/printing/print_preview_dialog_controller.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_commands.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/browser/ui/webui/print_preview/print_preview_handler.h"
+#include "chrome/browser/ui/webui/print_preview/print_preview_ui.h"
+#include "chrome/browser/ui/webui/print_preview/sticky_settings.h"
+#include "chrome/common/chrome_paths.h"
+#include "chrome/common/print_messages.h"
+#include "chrome/common/url_constants.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/ui_test_utils.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_ui_message_handler.h"
+#include "content/public/common/page_transition_types.h"
+#include "content/public/test/browser_test_utils.h"
+#include "content/public/test/test_navigation_observer.h"
+#include "content/public/test/test_utils.h"
+#include "net/base/filename_util.h"
+#include "printing/pdf_render_settings.h"
+#include "printing/units.h"
+#include "ui/events/keycodes/keyboard_codes.h"
+#include "ui/gfx/codec/png_codec.h"
+#include "ui/gfx/geometry/rect.h"
+#include "url/gurl.h"
+#include "ipc/ipc_message_macros.h"
+
+#if defined(OS_POSIX)
+#define STDIN_STREAM std::cin
+#elif defined(OS_WIN)
+#define STDIN_STREAM std::wcin
+#endif
+
+using content::WebContents;
+using content::WebContentsObserver;
+
+// Number of color channels in a BGRA bitmap.
+const int kColorChannels = 4;
+
+// Message refers to the 'UILoaded' message from print_preview.js.
+// It gets sent either from onPreviewGenerationDone or from
+// onManipulateSettings_() in print_preview.js
+enum State {
+  // Waiting for the first message so the program can select Save as PDF
+  kWaitingToSendSaveAsPdf = 0,
+  // Waiting for the second message so the test can set the layout
+  kWaitingToSendLayoutSettings = 1,
+  // Waiting for the third message so the test can set the page numbers
+  kWaitingToSendPageNumbers = 2,
+  // Waiting for the forth message so the test can set the headers checkbox
+  kWaitingToSendHeadersAndFooters = 3,
+  // Waiting for the fifth message so the test can set the background checkbox
+  kWaitingToSendBackgroundColorsAndImages = 4,
+  // Waiting for the sixth message so the test can set the margins combobox
+  kWaitingToSendMargins = 5,
+  // Waiting for the final message so the program can save to PDF.
+  kWaitingForFinalMessage = 6,
+};
+
+// Settings for print preview. It reflects the current options provided by
+// print preview. If more options are added, more states should be added and
+// there should be more settings added to this struct.
+struct PrintPreviewSettings {
+  PrintPreviewSettings(bool is_portrait,
+                       std::string page_numbers,
+                       bool headers_and_footers,
+                       bool background_colors_and_images,
+                       printing::MarginType margins,
+                       bool is_already_pdf)
+      : is_portrait(is_portrait),
+        page_numbers(page_numbers),
+        headers_and_footers(headers_and_footers),
+        background_colors_and_images(background_colors_and_images),
+        margins(margins),
+        is_already_pdf(is_already_pdf) {}
+
+  bool is_portrait;
+  std::string page_numbers;
+  bool headers_and_footers;
+  bool background_colors_and_images;
+  printing::MarginType margins;
+  bool is_already_pdf;
+};
+
+// Observes the print preview webpage. Once it observes the PreviewPageCount
+// message, will send a sequence of commands to the print preview dialog and
+// change the settings of the preview dialog.
+class PrintPreviewObserver : public WebContentsObserver {
+ public:
+  PrintPreviewObserver(WebContents* dialog, Browser* browser)
+      : WebContentsObserver(dialog),
+        browser_(browser),
+        state_(kWaitingToSendSaveAsPdf) {}
+
+  virtual ~PrintPreviewObserver() {}
+
+  // Sets closure for the observer so that it can end the loop.
+  void set_quit_closure(const base::Closure &closure) {
+    closure_ = closure;
+  }
+
+  // Actually stops the message_loop so that the test can proceed.
+  void EndLoop() {
+    base::MessageLoop::current()->PostTask(FROM_HERE, closure_);
+  }
+
+  // This method must always return false. If it ever returns true, it will
+  // cause the test to hang. This is because the PrintPreviewMessageHandler
+  // should still handle all of the messages to progress the print preview
+  // process.
+  bool OnMessageReceived(const IPC::Message& message) OVERRIDE {
+    IPC_BEGIN_MESSAGE_MAP(PrintPreviewObserver, message)
+      IPC_MESSAGE_HANDLER(PrintHostMsg_DidGetPreviewPageCount,
+                          OnDidGetPreviewPageCount)
+    IPC_END_MESSAGE_MAP();
+    return false;
+  }
+
+  // Gets the web contents for the print preview dialog so that the UI and
+  // other elements can be accessed.
+  WebContents* GetDialog() {
+    WebContents* tab = browser_->tab_strip_model()->GetActiveWebContents();
+    printing::PrintPreviewDialogController* dialog_controller =
+        printing::PrintPreviewDialogController::GetInstance();
+    WebContents* web_contents =
+        dialog_controller->GetPrintPreviewForContents(tab);
+    return web_contents;
+  }
+
+  // Gets the PrintPreviewUI so that certain elements can be accessed.
+  PrintPreviewUI* GetUI() {
+    return static_cast<PrintPreviewUI*>(
+        GetDialog()->GetWebUI()->GetController());
+  }
+
+  // Calls a javascript function that will change the print preview settings,
+  // such as the layout, the margins, page numbers, etc.
+  void ManipulatePreviewSettings() {
+    base::DictionaryValue script_argument;
+
+    if (state_ == kWaitingToSendSaveAsPdf) {
+      script_argument.SetBoolean("selectSaveAsPdfDestination", true);
+      state_ = settings_->is_already_pdf ?
+               kWaitingToSendPageNumbers : kWaitingToSendLayoutSettings;
+    } else if (state_ == kWaitingToSendLayoutSettings) {
+      script_argument.SetBoolean("layoutSettings.portrait",
+                                 settings_->is_portrait);
+      state_ = kWaitingToSendPageNumbers;
+    } else if (state_ == kWaitingToSendPageNumbers) {
+      script_argument.SetString("pageRange", settings_->page_numbers);
+      state_ = settings_->is_already_pdf ?
+               kWaitingForFinalMessage : kWaitingToSendHeadersAndFooters;
+    } else if (state_ == kWaitingToSendHeadersAndFooters) {
+      script_argument.SetBoolean("headersAndFooters",
+                                 settings_->headers_and_footers);
+      state_ = kWaitingToSendBackgroundColorsAndImages;
+    } else if (state_ == kWaitingToSendBackgroundColorsAndImages) {
+      script_argument.SetBoolean("backgroundColorsAndImages",
+                                 settings_->background_colors_and_images);
+      state_ = kWaitingToSendMargins;
+    } else if (state_ == kWaitingToSendMargins) {
+      script_argument.SetInteger("margins", settings_->margins);
+      state_ = kWaitingForFinalMessage;
+    } else if (state_ == kWaitingForFinalMessage) {
+      EndLoop();
+      return;
+    }
+
+    ASSERT_TRUE(!script_argument.empty());
+    GetUI()->web_ui()->CallJavascriptFunction(
+        "onManipulateSettingsForTest", script_argument);
+  }
+
+  // Function to set the print preview settings and save them so they
+  // can be sent later. Currently only used in the constructor. Will be
+  // used when creating a test and take command line arguments.
+  // |page_numbers| is a comma separated page range.
+  //    Example: "1-5,9" will print pages 1 through 5 and page 9. The pages
+  //    specified must be less than or equal to the maximum page number. An
+  //    empty string seems to be valid input, however further testing will be
+  //    required to see if that is actually true.
+  void SetPrintPreviewSettings(const PrintPreviewSettings& settings) {
+    settings_.reset(new PrintPreviewSettings(settings));
+  }
+
+ private:
+  // Listens for messages from the print preview dialog. Specifically, it
+  // listens for 'UILoadedForTest' and 'UIFailedLoadingForTest.'
+  class UIDoneLoadingMessageHandler : public content::WebUIMessageHandler {
+   public:
+    explicit UIDoneLoadingMessageHandler(PrintPreviewObserver* observer)
+        : observer_(observer) {}
+
+    virtual ~UIDoneLoadingMessageHandler() {}
+
+    // When a setting has been set succesfully, this is called and the observer
+    // is told to send the next setting to be set.
+    void HandleDone(const base::ListValue* /* args */) {
+      ASSERT_TRUE(observer_);
+      observer_->ManipulatePreviewSettings();
+    }
+
+    // Ends the test because a setting was not set successfully therefore, the
+    // test shouldn't continue.
+    // TODO(ivandavid): Print out error message to give context.
+    void HandleFailure(const base::ListValue* /* args */) {
+      FAIL();
+    }
+
+    // Sets up this class to listen for the UILoadedForTest and
+    // UIFailedLoadingForTest messages. These messages are sent by
+    // print_preview.js. On UILoadedForTest, a settings has been successfully
+    // set and its effects on the pdf have been finalized. On
+    // UIFailedLoadingForTest a setting has not been successfully set and the
+    // test should fail.
+    void RegisterMessages() OVERRIDE {
+      web_ui()->RegisterMessageCallback(
+          "UILoadedForTest",
+          base::Bind(&UIDoneLoadingMessageHandler::HandleDone,
+                     base::Unretained(this)));
+
+      web_ui()->RegisterMessageCallback(
+          "UIFailedLoadingForTest",
+          base::Bind(&UIDoneLoadingMessageHandler::HandleFailure,
+                     base::Unretained(this)));
+    }
+
+   private:
+    PrintPreviewObserver* observer_;
+
+    DISALLOW_COPY_AND_ASSIGN(UIDoneLoadingMessageHandler);
+  };
+
+  // Called when the observer gets the IPC message stating that the page count
+  // is ready. Due to forward declaration problem, the definition of the
+  // function must be separated from the declaration.
+  void OnDidGetPreviewPageCount(
+        const PrintHostMsg_DidGetPreviewPageCount_Params &params) {
+    WebContents* web_contents = GetDialog();
+    PrintPreviewUI* ui = GetUI();
+    ASSERT_TRUE(ui);
+    ASSERT_TRUE(ui->web_ui());
+    Observe(web_contents);
+    ASSERT_TRUE(web_contents);
+
+    // The web ui deallocates the memory for the handler when the web ui is
+    // destroyed.
+    ui->web_ui()->AddMessageHandler(new UIDoneLoadingMessageHandler(this));
+    ui->web_ui()->CallJavascriptFunction("onEnableManipulateSettingsForTest");
+  }
+
+  void DidCloneToNewWebContents(WebContents* old_web_contents,
+                                WebContents* new_web_contents) OVERRIDE {
+    Observe(new_web_contents);
+  }
+
+  void WebContentsDestroyed() OVERRIDE {
+    EndLoop();
+  }
+
+  Browser* browser_;
+  base::Closure closure_;
+  scoped_ptr<PrintPreviewSettings> settings_;
+
+  // State of the observer. The state indicates what message it is to send
+  // next. The state advances whenever the message handler calls
+  // ManipulatePreviewSettings() on the observer.
+  State state_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrintPreviewObserver);
+};
+
+class PrintPreviewPdfGeneratedBrowserTest : public InProcessBrowserTest {
+ public:
+  PrintPreviewPdfGeneratedBrowserTest() {}
+  virtual ~PrintPreviewPdfGeneratedBrowserTest() {}
+
+  // Navigates to the web page given, then initiates print preview and waits
+  // for all the settings to be set.
+  void NavigateAndPreview(const base::FilePath::StringType& file_name,
+                          PrintPreviewSettings settings) {
+    print_preview_observer_->SetPrintPreviewSettings(settings);
+    base::FilePath path(file_name);
+    GURL gurl = net::FilePathToFileURL(path);
+
+    ui_test_utils::NavigateToURL(browser(), gurl);
+
+    base::RunLoop loop;
+    print_preview_observer_->set_quit_closure(loop.QuitClosure());
+    chrome::Print(browser());
+    loop.Run();
+  }
+
+  // Prints the webpage to pdf, after the settings have been set.
+  void Print() {
+    ASSERT_FALSE(pdf_file_save_path_.empty());
+    base::RunLoop loop;
+    print_preview_observer_->set_quit_closure(loop.QuitClosure());
+    print_preview_observer_->GetUI()->handler_->FileSelected(
+        pdf_file_save_path_, 0, NULL);
+    loop.Run();
+  }
+
+  // Initializes the pdf lib functions. Called once when browser test starts.
+  // Library is closed when the test ends.
+  void InitPdfFunctions() {
+    base::FilePath pdf_module_path;
+
+    ASSERT_TRUE(PathService::Get(chrome::FILE_PDF_PLUGIN, &pdf_module_path));
+    ASSERT_TRUE(base::PathExists(pdf_module_path));
+    pdf_lib_.Reset(base::LoadNativeLibrary(pdf_module_path, NULL));
+
+    ASSERT_TRUE(pdf_lib_.is_valid());
+    pdf_to_bitmap_func_ =
+        reinterpret_cast<PDFPageToBitmapProc>(
+            pdf_lib_.GetFunctionPointer("RenderPDFPageToBitmap"));
+
+    pdf_doc_info_func_ =
+        reinterpret_cast<GetPDFDocInfoProc>(
+            pdf_lib_.GetFunctionPointer("GetPDFDocInfo"));
+
+    pdf_page_size_func_ =
+        reinterpret_cast<GetPDFPageSizeByIndexProc>(
+            pdf_lib_.GetFunctionPointer("GetPDFPageSizeByIndex"));
+
+    ASSERT_TRUE(pdf_to_bitmap_func_);
+    ASSERT_TRUE(pdf_doc_info_func_);
+    ASSERT_TRUE(pdf_page_size_func_);
+  }
+
+  // Converts the pdf to a png file, so that the layout test can do an image
+  // diff on this image and a reference image.
+  void PdfToPng() {
+    std::string data;
+    int num_pages;
+    const int kDpi = 300;
+    double max_width = 0;
+    std::vector<uint8_t> bitmap_data;
+    double total_height = 0;
+
+    ASSERT_TRUE(base::ReadFileToString(pdf_file_save_path_, &data));
+    ASSERT_TRUE(pdf_doc_info_func_(data.data(),
+                                   data.size(),
+                                   &num_pages,
+                                   &max_width));
+
+    max_width = printing::ConvertPointsToPixelDouble(max_width);
+
+    for (int i = 0; i < num_pages; ++i) {
+      double width, height;
+      bool autorotate = false;
+      ASSERT_TRUE(pdf_page_size_func_(
+          data.data(), data.size(), i, &width, &height));
+
+      width = printing::ConvertPointsToPixelDouble(width);
+      height = printing::ConvertPointsToPixelDouble(height);
+
+      // The image needs to be rotated if the width is > to the height. This
+      // is because, when the image is printed to a pdf, if it is in landscape
+      // mode (or the document is just wide) if will be printed horizontally,
+      // not vertically. However, if it printed, it would have been rotated.
+      // Therefore, the image has to be automatically rotated here to reflect
+      // what is printed.
+      //
+      // TODO(ivandavid): See if this is a linux only problem or if its on
+      // every platform. It might not matter, since if its autorotated, the
+      // width will never be greater than the height, so the if conditional
+      // will never evaluate to true.
+
+      if (width > height) {
+        std::swap<double>(width, height);
+        autorotate = true;
+      }
+
+      total_height += height;
+      gfx::Rect rect(width, height);
+      printing::PdfRenderSettings settings(rect, kDpi, true);
+
+      // TODO(ivandavid): Implement correct overflow detection. Need to check

[ivandavid, 2014/07/09 19:58:22]

I'll do this in the next patch set. I'll see if I can find something in the
chromium code that can do it for me.

+      // for signed multiplication overflow. Can't use size_t or any unsigned
+      // stuff, b/c internally everything in PdfRenderSettings is signed it
+      // seems.
+
+      std::vector<uint8_t> page_bitmap_data(
+          kColorChannels * settings.area().size().GetArea());
+
+      ASSERT_TRUE(pdf_to_bitmap_func_(data.data(),
+                                      data.size(),
+                                      i,
+                                      page_bitmap_data.data(),
+                                      settings.area().size().width(),
+                                      settings.area().size().height(),
+                                      settings.dpi(),
+                                      settings.dpi(),
+                                      autorotate));
+
+      // Must multiply width & max_width by number of color channels because
+      // the bitmap stores individual bytes, not int32's.
+      FillPng(&page_bitmap_data, width * kColorChannels,
+              max_width * kColorChannels,
+              settings.area().size().height());
+      bitmap_data.insert(bitmap_data.end(),
+                         page_bitmap_data.begin(),
+                         page_bitmap_data.end());
+    }
+
+    CreatePng(bitmap_data, max_width, total_height);
+  }
+
+  // Fills out a bitmap with the color white to fit within a png that is wider
+  // than the bitmap. This prevents the image from being cutoff or split. The
+  // desired_width must be greater than the current width of the image.
+  void FillPng(std::vector<uint8_t>* bitmap,
+               int current_width,
+               int desired_width,
+               int height) {
+    // Need to seperate the iterator and index. We can't use an iterator only
+    // since the vector will most likely be resized and will render the
+    // iterator invalid. Might need to re-do to make it faster, but there
+    // don't seem to be any speed issues.
+    ASSERT_TRUE(bitmap);
+    ASSERT_LE(current_width, desired_width);
+    const uint8_t kColorByte = 255;
+    size_t index = 0;
+    for (int i = 0; i < height; ++i, index = i * desired_width) {
+      index += current_width - 1;
+      std::vector<uint8_t>::iterator iterator = bitmap->begin();
+      std::advance(iterator, index);
+      // 255,255,255,255 is white in BGRA
+      bitmap->insert(iterator, desired_width - current_width, kColorByte);
+    }
+  }
+
+  // Sends the png image to the layout test framework for comparison.
+  void SendPng() {
+    // Send image header & hash_ to the layout test framework.
+    printf("Content-Type: image/png\n");
+    printf("ActualHash: %s\n", base::MD5DigestToBase16(hash_).data());
+    printf("Content-Length: %" PRIuS "\n", output_.size());
+
+    for (size_t i = 0; i < output_.size(); ++i)
+      printf("%c", output_[i]);
+
+    printf("#EOF\n");
+    fflush(stdout);
+    fprintf(stderr, "#EOF\n");
+    fflush(stderr);
+  }
+
+  // Duplicates the tab that was created when the browser opened. This is done,
+  // so that the observer can listen to the duplicated tab as soon as possible
+  // and start listening for messages related to print preview.
+  void DuplicateTab() {
+    WebContents* tab =
+        browser()->tab_strip_model()->GetActiveWebContents();
+    ASSERT_TRUE(tab);
+
+    print_preview_observer_.reset(new PrintPreviewObserver(tab, browser()));
+    chrome::DuplicateTab(browser());
+
+    WebContents* initiator =
+        browser()->tab_strip_model()->GetActiveWebContents();
+    ASSERT_TRUE(initiator);
+    ASSERT_NE(tab, initiator);
+  }
+
+  // Resets the test so that another web page can be printing.
+  // Deletes the duplicate tab as it isn't needed anymore.
+  void Reset() {
+    output_.clear();
+    ASSERT_EQ(browser()->tab_strip_model()->count(), 2);
+    chrome::CloseTab(browser());
+    ASSERT_EQ(browser()->tab_strip_model()->count(), 1);
+  }
+
+  // Creates a temporary directory to store the file that will be used for
+  // stdin to accept input. Also sets up the path to save the pdf file that
+  // will be printed. Everything is cleaned up automatically once the test
+  // ends.
+  void SetupStdinAndSavePath() {
+    // Sends a message to the layout test framework indicating indicating
+    // that the browser test has completed setting itself up. The layout
+    // test will then expect the file path for stdin.
+    base::FilePath tmp_path;
+    printf("#READY\n");
+    fflush(stdout);
+
+    ASSERT_TRUE(tmp_dir_.CreateUniqueTempDir());
+    ASSERT_TRUE(base::CreateTemporaryFileInDir(tmp_dir_.path(), &tmp_path));
+    ASSERT_TRUE(freopen(tmp_path.value().c_str(), "r", stdin));
+
+    pdf_file_save_path_ = tmp_dir_.path().AppendASCII("dummy.pdf");
+
+    // Send the file path to the layout test framework so that it can
+    // communicate with this browsertest.
+    printf("StdinPath: %s\n#EOF\n", tmp_path.value().c_str());
+    fflush(stdout);
+  }
+
+ private:
+  // Generates a png from bitmap data and stores it in output_.
+  void CreatePng(
+        const std::vector<uint8_t>& bitmap_data, int width, int height) {
+    std::string hash_data(bitmap_data.begin(), bitmap_data.end());
+    base::MD5Sum(
+        static_cast<const void*>(hash_data.data()), hash_data.size(), &hash_);
+
+    gfx::Rect png_rect(width, height);
+
+    // tEXtchecksum looks funny, but that's what the layout test framework
+    // expects.
+    std::string comment_title("tEXtchecksum\x00");
+    gfx::PNGCodec::Comment hash_comment(comment_title,
+                                        base::MD5DigestToBase16(hash_));
+
+    std::vector<gfx::PNGCodec::Comment> comments;
+    comments.push_back(hash_comment);
+
+    ASSERT_TRUE(gfx::PNGCodec::Encode(bitmap_data.data(),
+                                      gfx::PNGCodec::FORMAT_BGRA,
+                                      png_rect.size(),
+                                      png_rect.size().width() * kColorChannels,
+                                      false,
+                                      comments,
+                                      &output_));
+  }
+
+  scoped_ptr<PrintPreviewObserver> print_preview_observer_;
+  base::FilePath pdf_file_save_path_;
+
+  // These typedefs are function pointers to pdflib functions that give
+  // information about the pdf as a whole and about specific pages.
+
+  // Converts the pdf to a bitmap.
+  typedef bool (*PDFPageToBitmapProc)(const void* pdf_buffer,
+                                      int pdf_buffer_size,
+                                      int page_number,
+                                      void* bitmap_buffer,
+                                      int bitmap_width,
+                                      int bitmap_height,
+                                      int dpi_x,
+                                      int dpi_y,
+                                      bool autorotate);
+
+  // Gets the page count and maximum page width of the pdf in points.
+  typedef bool (*GetPDFDocInfoProc)(const void* pdf_buffer,
+                                    int buffer_size,
+                                    int* pages_count,
+                                    double* max_page_width);
+
+  // Gets the dimensions of a specific page.
+  typedef bool (*GetPDFPageSizeByIndexProc)(const void* pdf_buffer,
+                                            int buffer_size,
+                                            int index,
+                                            double* width,
+                                            double* height);
+
+  // Instantiations of the function pointers described above.
+  PDFPageToBitmapProc pdf_to_bitmap_func_;
+  GetPDFDocInfoProc pdf_doc_info_func_;
+  GetPDFPageSizeByIndexProc pdf_page_size_func_;
+
+  // Used to open up the library that contains the pdflib functions.
+  base::ScopedNativeLibrary pdf_lib_;
+
+  // Vector where the png is finally stored.
+  std::vector<unsigned char> output_;
+
+  // Image hash of the bitmap that is turned into a PNG. The hash is put into
+  // the PNG as a comment, as it is needed by the layout test framework.
+  base::MD5Digest hash_;
+
+  // Temporary directory for storing the pdf and the file for stdin.
+  base::ScopedTempDir tmp_dir_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrintPreviewPdfGeneratedBrowserTest);
+};
+
+IN_PROC_BROWSER_TEST_F(PrintPreviewPdfGeneratedBrowserTest,
+                       MANUAL_DummyTest) {
+  // What this code is supposed to do:
+  // -Setup communication with the layout test framework
+  // -Print webpage to a pdf
+  // -Convert pdf to a png
+  // -Send png to layout test framework, where it doesn an image diff
+  //  on the image sent by this test and a reference image.
+  //
+  // Throughout this code, there will be printf statements. The layout test
+  // framework uses stdout to get data from the browser test and uses stdin
+  // to send data to the browser test. Calling printf("#EOF\n") indicates that
+  // whatever block of data that the test was expecting has been completely
+  // sent. Sometimes EOF is printed to stderr because the test will expect it
+  // from stderr in addition to stdout for certain blocks of data.
+  InitPdfFunctions();
+  SetupStdinAndSavePath();
+
+  // There is no way to determine how many tests are to be run ahead of time
+  // without a ton of modifications to the layouy test framework. However,
+  // whenever it is done with a set of tests, it calls SIGKILL on the browser
+  // test that ran those set of tests. Thus, this while loop will end once the
+  // layout test framework decides to actually kill this process. For this to
+  // work, the test must be run with '--single_process'. There must be an
+  // underscore, not a dash, as that is something different.
+  while (true) {
+    base::FilePath::StringType cmd;
+    std::getline(STDIN_STREAM, cmd);
+    if (cmd.empty()) {
+      while (STDIN_STREAM.eof()) {
+        STDIN_STREAM.clear();
+        std::getline(STDIN_STREAM, cmd);
+        if (!cmd.empty()) {
+          break;
+        }
+      }
+    }
+
+    DuplicateTab();
+
+    // TODO(ivandavid): Get settings from file in resources.
+    PrintPreviewSettings settings(
+        true,
+        "",
+        false,
+        false,
+        printing::DEFAULT_MARGINS,
+        cmd.find(".pdf") != base::FilePath::StringType::npos);
+
+    // Splits the command sent by the layout test framework. The first command
+    // is always the file path to use for the test. The rest isn't relevant,
+    // so it can be ignored. The separator for the commands is an apostrophe.
+    std::vector<base::FilePath::StringType> cmd_arguments;
+    base::SplitString(cmd, '\'', &cmd_arguments);
+    base::FilePath::StringType test_name(cmd_arguments[0]);
+    NavigateAndPreview(test_name, settings);
+    Print();
+    PdfToPng();
+
+    // Message to the layout test framework indicating that it should start
+    // waiting for the image data, as there is no more text data to be read.
+    // There actually isn't any text data at all, however because the layout
+    // test framework requires it, a message has to be sent to stop it from
+    // waiting for this message and start waiting for the image data.
+    printf("#EOF\n");
+    fflush(stdout);
+
+    SendPng();
+    Reset();
+  }
+}