Implement window.print() on Android

chrome/browser/printing/print_job_worker.cc

Index: chrome/browser/printing/print_job_worker.cc
diff --git a/chrome/browser/printing/print_job_worker.cc b/chrome/browser/printing/print_job_worker.cc
index ee8cddea181a9a759182b4d828a3d4a45ae424da..eb0e94208159ce941623d1a7e0c21faf907c4e7b 100644
--- a/chrome/browser/printing/print_job_worker.cc
+++ b/chrome/browser/printing/print_job_worker.cc
@@ -10,6 +10,11 @@
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop.h"
 #include "base/values.h"
+
+#if defined(OS_ANDROID)
+#include "chrome/browser/android/tab_android.h"
+#endif
+
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/printing/print_job.h"
@@ -44,6 +49,9 @@ class PrintingContextDelegate : public PrintingContext::Delegate {
   gfx::NativeView GetParentView() override;
   std::string GetAppLocale() override;
 
+  // Not exposed to PrintingContext::Delegate because of dependency issues.
+  content::WebContents* GetWebContents();
+
  private:
   int render_process_id_;
   int render_view_id_;
@@ -59,19 +67,21 @@ PrintingContextDelegate::~PrintingContextDelegate() {
 }
 
 gfx::NativeView PrintingContextDelegate::GetParentView() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  content::RenderViewHost* view =
-      content::RenderViewHost::FromID(render_process_id_, render_view_id_);
-  if (!view)
-    return NULL;
-  content::WebContents* wc = content::WebContents::FromRenderViewHost(view);
-  return wc ? wc->GetNativeView() : NULL;
+  content::WebContents* wc = GetWebContents();
+  return wc ? wc->GetNativeView() : nullptr;
 }
 
 std::string PrintingContextDelegate::GetAppLocale() {
   return g_browser_process->GetApplicationLocale();
 }
 
+content::WebContents* PrintingContextDelegate::GetWebContents() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  content::RenderViewHost* view =
+      content::RenderViewHost::FromID(render_process_id_, render_view_id_);
+  return view ? content::WebContents::FromRenderViewHost(view) : nullptr;
+}
+
 void NotificationCallback(PrintJobWorkerOwner* print_job,
                           JobEventDetails::Type detail_type,
                           PrintedDocument* document,
@@ -112,7 +122,7 @@ void PrintJobWorker::SetNewOwner(PrintJobWorkerOwner* new_owner) {
 }
 
 void PrintJobWorker::GetSettings(
-    bool ask_user_for_settings,
+    GetSettingsAskParam ask_settings_type,
     int document_page_count,
     bool has_selection,
     MarginType margin_type) {
@@ -129,7 +139,7 @@ void PrintJobWorker::GetSettings(
 
   // When we delegate to a destination, we don't ask the user for settings.
   // TODO(mad): Ask the destination for settings.
-  if (ask_user_for_settings) {
+  if (ask_settings_type == GetSettingsAskParam::ASK_USER) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&HoldRefCallback, make_scoped_refptr(owner_),
@@ -137,6 +147,13 @@ void PrintJobWorker::GetSettings(
                               base::Unretained(this),
                               document_page_count,
                               has_selection)));
+  } else if (ask_settings_type == GetSettingsAskParam::SYSTEM_SPECIFIC) {
+    LOG(INFO) << "DGN SYSTEM_SPECIFIC! ";
+    BrowserThread::PostTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(&HoldRefCallback, make_scoped_refptr(owner_),
+                   base::Bind(&PrintJobWorker::ShowSystemDialog,
+                              base::Unretained(this))));
   } else {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
@@ -146,6 +163,25 @@ void PrintJobWorker::GetSettings(
   }
 }
 
+void PrintJobWorker::ShowSystemDialog() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  LOG(INFO) << "DGN ShowSystemDialog";
+
+#if defined(OS_ANDROID)
+  PrintingContextDelegate* pcd =
+      static_cast<PrintingContextDelegate*>(printing_context_delegate_.get());
+  content::WebContents* wc = pcd->GetWebContents();
+  TabAndroid* tab = TabAndroid::FromWebContents(wc);
+  if (tab) tab->SetPendingPrint(); // If fails or is not called, attempting to

[mlamouri (slow - plz ping), 2014/11/27 20:26:02]

I believe the coding style says:
if (tab)
  tab->SetPendingPrint();

[dgn, 2014/11/28 11:51:15]

Done.

+                                   // start a pending print does nothing and
+                                   // will notify that printing is finished.
+#endif
+
+  printing_context_->RequestSystemDialog(
+        base::Bind(&PrintJobWorker::GetSettingsDone,
+                   base::Unretained(this)));
+}
+
 void PrintJobWorker::SetSettings(
     scoped_ptr<base::DictionaryValue> new_settings) {
   DCHECK(task_runner_->RunsTasksOnCurrentThread());