[Aura] Added Support for rendering software compositor frames as cc::TextureLayers.

cc/resources/resource_provider.cc

Index: cc/resources/resource_provider.cc
diff --git a/cc/resources/resource_provider.cc b/cc/resources/resource_provider.cc
index 35457f70bb16657d25d438ef4d3bd52f8a73ce46..4562ca6b6e989ed615ccd71d2062072b60963b2c 100644
--- a/cc/resources/resource_provider.cc
+++ b/cc/resources/resource_provider.cc
@@ -83,6 +83,7 @@ ResourceProvider::Resource::Resource()
       enable_read_lock_fences(false),
       read_lock_fence(NULL),
       size(),
+      shared_memory(NULL),
       format(0),
       filter(0),
       type(static_cast<ResourceType>(0)) {}
@@ -107,6 +108,7 @@ ResourceProvider::Resource::Resource(
       enable_read_lock_fences(false),
       read_lock_fence(NULL),
       size(size),
+      shared_memory(NULL),
       format(format),
       filter(filter),
       type(GLTexture) {}
@@ -129,6 +131,7 @@ ResourceProvider::Resource::Resource(
       enable_read_lock_fences(false),
       read_lock_fence(NULL),
       size(size),
+      shared_memory(NULL),
       format(format),
       filter(filter),
       type(Bitmap) {}
@@ -273,12 +276,21 @@ ResourceProvider::ResourceId ResourceProvider::CreateResourceFromTextureMailbox(
   DCHECK(thread_checker_.CalledOnValidThread());
   // Just store the information. Mailbox will be consumed in LockForRead().
   ResourceId id = next_id_++;
-  unsigned texture_id = 0;
-  Resource resource(texture_id, gfx::Size(), 0, GL_LINEAR);
-  resource.external = true;
-  resource.allocated = true;
-  resource.mailbox = mailbox;
-  resources_[id] = resource;
+  if (mailbox.IsTexture()) {
+    unsigned texture_id = 0;
+    Resource resource(texture_id, gfx::Size(), 0, GL_LINEAR);
+    resource.external = true;
+    resource.allocated = true;
+    resource.mailbox = mailbox;
+    resources_[id] = resource;
+  } else if (mailbox.IsSharedMemory()) {
+    uint8_t *pixels = NULL;
+    Resource resource(pixels, mailbox.size(), 0, GL_LINEAR);
+    resource.external = true;
+    resource.allocated = true;
+    resource.mailbox = mailbox;
+    resources_[id] = resource;
+  }
   return id;
 }
 
@@ -323,20 +335,30 @@ void ResourceProvider::DeleteResourceInternal(ResourceMap::iterator it,
     DCHECK(context3d);
     GLC(context3d, context3d->deleteBuffer(resource->gl_pixel_buffer_id));
   }
-  if (!resource->mailbox.IsEmpty() && resource->external) {
-    WebGraphicsContext3D* context3d = output_surface_->context3d();
-    DCHECK(context3d);
+  if (resource->mailbox.IsValid() && resource->external) {
     unsigned sync_point = resource->mailbox.sync_point();
-    if (!lost_resource && resource->gl_id) {
-      GLC(context3d, context3d->bindTexture(
-          resource->mailbox.target(), resource->gl_id));
-      GLC(context3d, context3d->produceTextureCHROMIUM(
-          resource->mailbox.target(), resource->mailbox.data()));
+    if (resource->mailbox.IsTexture()) {
+      WebGraphicsContext3D* context3d = output_surface_->context3d();
+      DCHECK(context3d);
+      if (!lost_resource && resource->gl_id) {
+        GLC(context3d, context3d->bindTexture(
+            resource->mailbox.target(), resource->gl_id));
+        GLC(context3d, context3d->produceTextureCHROMIUM(
+            resource->mailbox.target(), resource->mailbox.data()));
+      }
+      if (resource->gl_id)
+        GLC(context3d, context3d->deleteTexture(resource->gl_id));
+      if (!lost_resource && resource->gl_id)
+        sync_point = context3d->insertSyncPoint();
+    } else {
+      DCHECK(resource->mailbox.IsSharedMemory());
+      if (resource->shared_memory) {
+        DCHECK(resource->shared_memory->memory() == resource->pixels);
+        delete resource->shared_memory;
+        resource->shared_memory = NULL;
+        resource->pixels = NULL;
+      }
     }
-    if (resource->gl_id)
-      GLC(context3d, context3d->deleteTexture(resource->gl_id));
-    if (!lost_resource && resource->gl_id)
-      sync_point = context3d->insertSyncPoint();
     resource->mailbox.RunReleaseCallback(sync_point, lost_resource);
   }
   if (resource->pixels)
@@ -478,18 +500,32 @@ const ResourceProvider::Resource* ResourceProvider::LockForRead(ResourceId id) {
   // Uninitialized! Call SetPixels or LockForWrite first.
   DCHECK(resource->allocated);
 
-  if (!resource->gl_id && resource->external && !resource->mailbox.IsEmpty()) {
-    WebGraphicsContext3D* context3d = output_surface_->context3d();
-    DCHECK(context3d);
-    if (resource->mailbox.sync_point()) {
-      GLC(context3d, context3d->waitSyncPoint(resource->mailbox.sync_point()));
-      resource->mailbox.ResetSyncPoint();
+  if (resource->external) {
+    if (!resource->gl_id && resource->mailbox.IsTexture()) {
+      WebGraphicsContext3D* context3d = output_surface_->context3d();
+      DCHECK(context3d);
+      if (resource->mailbox.sync_point()) {
+        GLC(context3d,
+            context3d->waitSyncPoint(resource->mailbox.sync_point()));
+        resource->mailbox.ResetSyncPoint();
+      }
+      resource->gl_id = context3d->createTexture();
+      GLC(context3d, context3d->bindTexture(
+          resource->mailbox.target(), resource->gl_id));
+      GLC(context3d, context3d->consumeTextureCHROMIUM(
+          resource->mailbox.target(), resource->mailbox.data()));
+    } else if (!resource->shared_memory && resource->mailbox.IsSharedMemory()) {
+      CHECK(!resource->pixels);
+      resource->size = resource->mailbox.size();
+      resource->shared_memory = new base::SharedMemory(
+          resource->mailbox.handle(), false);
+      const size_t size = 4 * resource->size.GetArea();
+      bool success = resource->shared_memory->Map(size);
+      CHECK(success);
+      resource->format = GL_RGBA;
+      resource->pixels =
+          reinterpret_cast<uint8_t*>(resource->shared_memory->memory());
     }
-    resource->gl_id = context3d->createTexture();
-    GLC(context3d, context3d->bindTexture(
-        resource->mailbox.target(), resource->gl_id));
-    GLC(context3d, context3d->consumeTextureCHROMIUM(
-        resource->mailbox.target(), resource->mailbox.data()));
   }
 
   resource->lock_for_read_count++;
@@ -857,7 +893,7 @@ bool ResourceProvider::TransferResource(WebGraphicsContext3D* context,
   Resource* source = &it->second;
   DCHECK(!source->locked_for_write);
   DCHECK(!source->lock_for_read_count);
-  DCHECK(!source->external || (source->external && !source->mailbox.IsEmpty()));
+  DCHECK(!source->external || (source->external && source->mailbox.IsValid()));
   DCHECK(source->allocated);
   if (source->exported)
     return false;
@@ -866,7 +902,8 @@ bool ResourceProvider::TransferResource(WebGraphicsContext3D* context,
   resource->filter = source->filter;
   resource->size = source->size;
 
-  if (source->mailbox.IsEmpty()) {
+  // TODO(skaslev) Implement this path for shared memory resources.
+  if (!source->mailbox.IsTexture()) {
     GLC(context3d, context3d->genMailboxCHROMIUM(resource->mailbox.name));
     source->mailbox.SetName(resource->mailbox);
   } else {