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alloy: Add support for the new non-PPAPI PDF viewer (see issue #3047)

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Enable by passing `--enable-features=PdfUnseasoned` on the command line.
This commit is contained in:
Marshall Greenblatt
2021-11-23 15:28:12 -05:00
parent d6d316e304
commit c75ebbccec
11 changed files with 244 additions and 173 deletions
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34
libcef/browser/extensions/extension_system.cc
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@ -8,7 +8,6 @@
#include <string>
#include "libcef/browser/extension_impl.h"
#include "libcef/browser/extensions/pdf_extension_util.h"
#include "libcef/browser/extensions/value_store/cef_value_store_factory.h"
#include "libcef/browser/thread_util.h"
#include "libcef/common/extensions/extensions_util.h"
@ -22,6 +21,7 @@
#include "base/strings/string_tokenizer.h"
#include "base/strings/utf_string_conversions.h"
#include "base/threading/thread_restrictions.h"
#include "chrome/browser/pdf/pdf_extension_util.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/chrome_paths.h"
#include "components/crx_file/id_util.h"
@ -179,8 +179,8 @@ void CefExtensionSystem::Init() {
ready_.Signal();
// Add the internal PDF extension. PDF loading works as follows:
// 1. The PDF PPAPI plugin is registered in libcef/common/content_client.cc
// ComputeBuiltInPlugins to handle the kPDFPluginOutOfProcessMimeType.
// 1. The PDF plugin is registered in libcef/common/content_client.cc
// ComputeBuiltInPlugins to handle the pdf::kInternalPluginMimeType.
// 2. The PDF extension is registered by the below call to AddExtension and
// associated with the "application/pdf" mime type.
// 3. Web content running in the owner CefBrowser requests to load a PDF file
@ -230,24 +230,34 @@ void CefExtensionSystem::Init() {
// CefExtensionsBrowserClient::LoadResourceFromResourceBundle
// and CefComponentExtensionResourceManager. Access to chrome://resources
// is granted via CefExtensionWebContentsObserver::RenderViewCreated.
// 15.The PDF extension calls chrome.mimeHandlerPrivate.getStreamInfo
// (chrome/browser/resources/pdf/browser_api.js) to retrieve the PDF
// resource stream. This API is implemented using Mojo as described in
// libcef/common/extensions/api/README.txt.
// 16.The PDF extension requests the PDF PPAPI plugin to handle
// kPDFPluginOutOfProcessMimeType. Approval arrives in the guest renderer
// 15.The PDF extension requests the PDF plugin to handle
// pdf::kInternalPluginMimeType. Approval arrives in the guest renderer
// process via ExtensionFrameHelper::OnExtensionResponse which calls
// NativeExtensionBindingsSystem::HandleResponse. This triggers creation of
// an HTMLPlugInElement via native V8 bindings to host the PDF plugin.
// 16.- With the old PPAPI plugin:
// The PDF extension calls chrome.mimeHandlerPrivate.getStreamInfo
// (chrome/browser/resources/pdf/browser_api.js) to retrieve the PDF
// resource stream. This API is implemented using Mojo as described in
// libcef/common/extensions/api/README.txt.
// - With the new PdfUnseasoned plugin:
// The PDF resource navigation is redirected by PdfNavigationThrottle and
// the stream contents are replaced by PdfURLLoaderRequestInterceptor.
// 17.HTMLPlugInElement::RequestObject is called in the guest renderer process
// and determines that the PDF PPAPI plugin should be handled internally
// and determines that the PDF plugin should be handled internally
// (handled_externally=false). A PluginDocument is created and
// AlloyContentRendererClient::OverrideCreatePlugin is called to create a
// WebPlugin.
// 18.The PDF extension and PDF plugin are now loaded. Print commands, if
// 18.- With the old PPAPI plugin:
// The PDF plugin is loaded by ChromeContentRendererClient::CreatePlugin
// calling RenderFrameImpl::CreatePlugin.
// - With the new PdfUnseasoned plugin:
// The PDF plugin is loaded by ChromeContentRendererClient::CreatePlugin
// calling pdf::CreateInternalPlugin.
// 19.The PDF extension and PDF plugin are now loaded. Print commands, if
// any, are handled in the guest renderer process by ChromePDFPrintClient
// and CefPrintRenderFrameHelperDelegate.
// 19.When navigating away from the PDF file or closing the owner CefBrowser
// 20.When navigating away from the PDF file or closing the owner CefBrowser
// the guest WebContents will be destroyed. This triggers a call to
// CefMimeHandlerViewGuestDelegate::OnGuestDetached which removes the
// routing ID association with the owner CefBrowser.